Aside from our five top product recommendations, we’ll also enumerate the main characteristics that should dictate your purchase. Shopping for rock tumblers has never been easier – that’s for sure.

Best Rock Tumbler

Let's take a look on our top recommendations for the best rock tumbler:

Winner: Tru-Square Metal Products Heavy Duty Rotary Tumbler

This item qualifies as the best rock tumbler for several reasons. For one thing, we would recommend it to almost every user. That’s primarily because the 15-pound capacity makes it appropriate for everyday use.

At the same time, you can depend on it for obtaining professional results, which is always of major interest for genuine enthusiasts. We would recommend it to hobbyists, collectors, even schools or laboratories – since the price-quality ratio is on point.

Since this is a rotary tumbler, it polishes the rocks similarly to the way in which water polishes rocks. To be more specific, the rock is polished by stimulating the action of ocean waves. It is needless to say that such a unit will undoubtedly polish rocks way quicker than the ocean, but it’s still nice to know.

Even so, it might take a while to transform rough rocks into polished ones – perhaps a month or so. A nice design feature of this rock tumbler is the use of durable, sturdy materials. Essentially, this is a critical element. Hence, the steel hexagon barrel translates into optimal longevity and strength.

At the same time, the removable rubber liner is a nice addition. That’s because it guarantees an enhanced efficiency.

OUR RATING

Moving on, the 115-volt fan-cooled motor prevents overheating, which is a key element in the reliability of the item. We’ve tested this rock tumbler with various types of rocks and we were pleasantly impressed by the results, every single time.

We can assure you that this unit can handle a wide range of operations such as fine polishing and coarse polishing. Plus, it is compatible with metals – brass included.

On the other side, you should note that this unit is pretty loud – 65 to 115 dB. Therefore, you may not be able to use it anywhere around the house. Actually, the unit is much louder after you introduce the rocks. Additionally, as the rock gets smoother, the motor isn’t as loud as in the beginning.

Bear in mind that if the motor is too empty, this could also cause extra noise. Concurrently, the motor doesn’t have a variable speed – as it has to function at the optimal tumbling speed. As for the size of the rocks you may introduce in the rock tumbler, you should follow this rule: avoid placing rocks that are larger than ½ of the barrel’s diameter.

Overall, this is a great unit that won’t disappoint you – being rated as the best rock tumbler for sea glass. 

Runner-Up: Lortone 3A Deluxe Rock Tumbler Kit

Another alternative for the best rock tumbler kit worthy of your attention is the Lortone 3A Deluxe Rock Tumbler Kit. This is the perfect product for jewelry makers, rock polishing hobbyists, craftspeople, so on and so forth.

Lortone is actually one of the most renowned manufacturers, as it produces durable and reality rock tumblers whose operation is quiet. And this particular item can hold roughly 3 pounds of rock, which is quite significant in comparison with other items.

As you might expect, the kit incorporates what you need to get started, namely a rotary tumbler, pre-measured quantities of four polishing grits, 2 lbs. of select tumbling rock mix, and a comprehensive set of instructions.

Using this rock tumbler is fairly easy. It’s worth noting is that the motor is engineered to last for years – that is to say, you are likely to get a lot of use out of the unit.  

We’ve also tested this product with broken pieces of glass, and we obtained excellent results, in the sense that we got a smooth finish or beach glass effect.

OUR RATING

Bear in mind that each step of the polishing process entails at least a full week or ten days. Still, this will widely depend on the hardness of the stone. You know what they say: one cannot rush nature, and this is definitely true when it comes to polishing rocks.

Additionally, during our tests, we didn’t experience any unsightly, unpleasant leaks or mess, which was great.

Although the manufacturer clearly states that the polisher can run 24 hours per day for years, we noticed that the unit tends to get overheated. Therefore, you should unplug the device every now and then to prevent that from happening.

Moving on, the patented rubber barrel featuring a quick-seal cover produces impeccably polished pieces. At the same time, it aims at absorbing part of the sound, ensuring a quiet operation.

The unit does a nice job at removing the rough edges of the rocks, producing nicely-rounded corners. This is what makes it adequate for tumbling hard materials. As a rule of thumb, it takes up to six weeks to completely polish a batch of rocks.

Alternative: NATIONAL GEOGRAPHIC Professional Rock Tumbler

Many rock polishing hobbyists outline that this unit is the best rock tumbler for the money. That’s because it comes with a full kit, comprising of everything you might need.

Many people prefer investing in a rock tumbler that features a complete kit. And this particular unit comes accompanied by four polishing grits, rough gemstones, an information guide, and instructions.

What is more, the tumbler features a 2 lb. leak-proof rubber barrel. Additionally, the barrel is equipped with a stainless steel cover.

A nice characteristic is the noise-reducing design – considering that most units are rather noisy, this is a nice addition. Nonetheless, similar to other products, the noise level alters depending on the rock polishing stage. That is to say, if you place it in the garage, the people inside the house won’t be bothered by the noise.

We like that it can accommodate up to 2 lbs. of stones at a time. There is an automatic shutoff timer that has the role of preventing the over-tumbling of the rocks. This can be quite helpful if you cannot monitor the stones; as the machine will turn off when the time is right.

OUR RATING

Another reason why this is the best rock tumbler for the money is the complete kit offered by the manufacturer. There is also an educational pamphlet featuring a bunch of useful tips for those who are new to this hobby.

Essentially, this unit has a range of interesting features. For example, the speed control timer enables you to select the operating speed. If you want to create sea glass, you can accomplish that by using this rock tumbler.

On the other side, a potential drawback could be that closing the lid on the barrel is quite difficult – especially for beginners. Nevertheless, if you follow the instructions closely, you’ll eventually nail it.

On a different note, the grit provided by the manufacturer is sufficient for a single round only; this means you should purchase more grit separately. All in all, this is a great unit for eager hobbyists. It has a nice assembly of features and the complete kit is definitely a plus.

Best Rock Tumbler For Beginner

Here are our top picks for this category:

Winner: Discover With Dr. Cool Hobby Rock Tumbler

This is the best rock tumbler for kids, allowing them to transform plain rocks into treasures. This can be a really enjoyable pastime as it allows children to learn a lot about rocks, their characteristics, and geology, in general. 

To start with, you get a complete tumbling kit with your purchase. The kit includes the tumbler and barrel, 9 different types of gemstones, 4-grade polishing grit, a useful learning guide, and instructions, as well as jewelry fastenings.

We can assure you that using this unit is quite easy. This is good news especially for beginners – right?

What you need to do is add water, the polishing grit, and the stone in the tumbling machine – and there you have it. As soon as you set the timer, the unit will start working on transforming the rocks into timeless treasures.

OUR RATING

Considering that this unit is mainly targeted for children, you might be curious how long it takes for the rock tumbler to polish the rocks. For the most part, a complete polishing process takes roughly four weeks.

Since there are four different grades of grit, each grade should be programmed for about a week or so. At the same time, you may definitely re-use the grit. Even though, over time, with continuous use, it is likely to wear out.

Another feature worth mentioning is the days-to-tumble setting. This allows you to program when the unit should automatically stop after a given number of days.

As for its operation, it is fairly quiet, yet it isn’t the quietest. Therefore, you might still hear it working even though the garage door is closed – still, this might depend on the insulation you have in your garage (or wherever you decide to use it).

Runner-Up: NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit

We continue our rock tumbler reviews with another high-quality unit manufactured by National Geographic. It is the best-rated rock tumbler for beginners and children because it comes with everything you need.

To be more precise, you get nine different types of rough gemstones, jewelry fastenings, polishing grits, an instructional booklet and an educational guide.

We appreciate that the barrel has a leak-proof design to prevent water from leaking out during use. We find that the 2-year warranty is a nice addition, considering that it gives one peace of mind.

As for the barrel’s capacity, it is of 1 lb. The unit weighs roughly 4 pounds, making it widely suitable for children passionate about geology. Since the cap of the barrel is made of stainless steel, this does a good job at diminishing the noise produced by the unit.

OUR RATING

So, we could say that the design of the unit is really efficient from this point of view. At the same time, the automatic shut-off timer is just as handy, especially if we were to consider the affordability of the unit.

As we tested the product, we were pleasantly surprised by the way in which the stones gradually changed. Considering that this unit is mainly targeted for children, the results were spectacular. After completing the first step only, we’ve noticed that the rock’s edges were smoothened, and the dents featured fewer lines.

What is more, after the second round, the rock’s edges were already rounded off, while the dents were shallower. The bottom line is that this works great – not to mention that using it is a breeze.

Nevertheless, bear in mind that the device should run constantly for every polishing round. This could be a tad too long for some people, especially since the unit is rather noisy. Therefore, if you want to pause the device, you might delay the process altogether.

What Features To Look Out For

When you’re shopping for the best rock tumbler, inevitably, you’ll ask yourself what is the best rock tumbler? This is self-explanatory, especially if you want to pick a product that meets your specific needs.

Without further ado, let’s see the main features that you should take into consideration.

Capacity

To start with, the best rock tumbler is the one that meets your needs. And a primary consideration is a tumbler’s capacity or size – since these two are obviously connected.

Barrels and bowels come in various sizes. Therefore, it’s critical to estimate how large your batches will be. Additionally, you should assess the size of the rocks you plan on polishing.

For example, if you want to pick up rock polishing as a hobby, then getting a barrel whose capacity ranges from 3 to 6 pounds could be a good idea. Note that this size is appropriate if the stones you intend to polish measure ¾ to 1 inch.

Nevertheless, bear in mind that this might prevent you from polishing larger stones. However, at the end of the day, it all depends on how you want to use the unit.

An excellent mid-sized option would be a barrel whose capacity is 4 to 4.5 pounds. This should easily accommodate stones that are up to 3.25 inches – which is roughly the size of a typical tennis ball.

Still, bear in mind that in order for the best rock tumbler to work, it should only be filled 2/3 to ¾. Therefore, picking a bigger capacity isn’t necessarily better when you’re assessing the capacity of different units.

Does It Come As A Starter Kit?

Whether you’re looking for the best vibratory rock tumbler or the best rotary unit, you might also check the unit that comes with a starter kit.

This is specifically great if you’re a beginner. Conversely, if you’re shopping for a rock tumbler for kids, this might also make more sense – this way, you won’t have to do additional shopping.

Of course, after you get started, you’ll have to invest in other items, but, at the very least, having a complete kit will make things easier at first.

As you’ve seen in our reviews of the best rock tumbler, some of our product recommendations include stones, comprehensive guides, different grits, jewelry fastenings, and so on.

Noise Reduction

Generally speaking, rock tumblers tend to be quite noisy – many people find this annoying, but this is what it is. Even the best rock tumbler is likely to cause noise.

Nevertheless, there are still some distinctions in this area. For instance, some units are genuinely noisy, in the sense that they might disrupt your daily activities. However, others can run without causing a lot of disruption to the household.

After conducting various tests, we’ve come to the conclusion that rubber barrel tumblers are significantly quieter than plastic barrel ones. Therefore, you might bear this in mind during the shopping process, especially if noise reduction is an important characteristic for you.

Even so, you should note that such a unit is noisy, by definition. The best thing you could do is find a place for it in the garage (this is just an example) so that the noise wouldn’t be a source of annoyance.

Overload Protection

You might know by now that, in order to get the results you want, you should allow the rock tumbler to run for days. Nonetheless, in some situations, this might lead to the overheating of the motor, which could cause other complications and problems.

So, if a unit has overload protection, it means that the motor will shut off automatically in the case of excessive load and utilization. This is a nice feature as it prolongs the lifespan of the unit.

Timer And Speed Controls

Some of the best features on a rock tumbler are the timer and speed controls. For instance, a unit that has a timer control allows you to program for how many days it should run before it automatically turns off. It goes without saying that this feature can be really convenient.

Still, other units allow you to regulate the speed. This is excellent especially if you want to obtain very specific results. 

Warranty

Customers should always assess a product’s warranty information before making an investment. We could argue that a rock tumbler is a considerable investment; therefore, you should definitely check the item’s warranty.

The minimum warranty provided by most manufacturers is of one year, but other companies are more generous in this respect. As a matter of fact, some either offer a money-back guarantee if the product is defective or doesn’t address the user’s needs.

As a rule of thumb, it’s always worth to check all the specifications linked to a product, to make a sensible decision.

Conclusion

To conclude, there are numerous products on the market to choose from if you’re on the lookout for the best rock tumbler. Ultimately, you should base your decision on the following elements: the product’s unique features and performance specifications, speed settings, automatic shut off, warranty, so on and so forth.

If you’ve never tried rock polishing beforehand, perhaps it would be a better idea to invest in a cheaper item, until you get the hang of it. In time, you might replace your original equipment.

At the same time, a unit’s capacity and size is another significant consideration that shouldn’t be overlooked. We hope that you’ve found our best rock tumbler reviews helpful. Do take the time to read our detailed analyses of our top products, especially if you’re thinking of getting one of them!

Perhaps our review will help you establish that. So, make sure you stick with us till the end!

About The Product

It is implied that National Geographic is a top manufacturer when it comes to rock tumblers and similar science-oriented items. They engineer products suitable for both individual and commercial use, being renowned for their quality and reliability.

Essentially, this kit is a good example of the company’s legacy. What should you know about it? The kit contains a tumbler, sifter, four polishing grits, learning guide, and nine different types of rough gemstones.

The Results

Whoever said that you can’t get a high-quality, sturdy rock tumbler for less than $100 was wrong. This unit demonstrates that. To begin with, the barrel has a stainless steel cover, which is the ultimate guarantee of its durability.

The 1-lbs. capacity is rather small, but beginners and children might still find it suitably sized. It all depends on your need and the way in which you intend on using the machine.

Of course, we like that the unit is engineered so that it emits as little noise as possible. Most rock polishing hobbyists are aware that most units are noisy; therefore, you shouldn’t expect not to hear this at all during its operation.

At the same time, the smart engineering prevents leakage incidents, which is just as important. For instance, as the machine functions on its own for weeks, leakage incidents could easily go unnoticed, which is why this feature is of great importance.

Plus, since you get nine types of different gemstones, you can really get to work the minute after you unbox the machine. So, if you’re eager to give it a run, this is great.

If you’re interested in jewelry making, you will definitely find the jewelry fastenings to be handy, as well. What is more, the automatic shut-off timer will definitely help you to save on energy costs. Plus, this plays a role in extending the lifespan of the rock tumbler.

Considering that the size of the barrel is rather small – 1 lbs. – we would recommend this to hobbyists that are just starting out to tumble rocks. Otherwise, you might be disappointed by this unit’s limited capacity.

What Others Say

As a rule of thumb, we always look for customer reviews before making an important purchase. And it would be safe to say that a rock polishing unit is a significant investment.

That being said, we weren’t a bit surprised by the high number of customer reviews we could find, or by the high ratings. This is definitely a nice unit and both the reviews and ratings reflect that.

Some people indicated that this unit is best suited for children. And this may be true – due to its small capacity. But this isn’t necessarily the case. If you’re a hobbyist on a budget, you won’t be disappointed by your purchase, as long as you can deal with the 1-lbs. barrel capacity.

On the other side, in spite of the noise minimizing design, we noticed some complaints regarding the noisy operation of the unit. Still, this isn’t a fault of the product, as it is something that is implied with most rock tumblers on the market.

What We Liked

If we had to list the things we enjoyed most about this National Geographic Rock Tumbler Kit, the first thing on the list would definitely be the price-quality ratio. It is an excellent budget choice for both children and beginners.

The instructions included by the manufacturer can be really helpful if you’ve never used such a machine beforehand. Plus, the fact that it is lightweight comes as a pro, since you can easily carry it around – even children can do that effortlessly.

Concurrently, the fact that you get a complete, comprehensive kit is another thing we like. In fact, this makes the unit a great idea for a present.

What We Didn’t Like

On the other hand, the unit is a bit loud. While this isn’t necessarily an engineering fault, it can be an annoyance to some people. This also depends on the place where you plan on using the machine. If your insulation is decent, then you shouldn’t be too bothered by this.

At the same time, we noticed that the unit has the tendency to overheat. Therefore, it might be recommended to pause the machine every now and then. It goes without saying that this will make the polishing process last more than you’d want.

Buying Advice

We’ve already mentioned a couple of times that this unit is among the best rock tumblers under $100. And we stand by it. Plus, Amazon has some great discounts if you get it from there – we received a 7 percent discount, which isn’t a lot, but is still something.

The 2-year warranty, as well as the money-back guarantee, offer peace of mind.

Final Thoughts

In summary, you have learned by now that we really enjoyed testing and reviewing the National Geographic Hobby Rock Tumbler Kit for you. Nevertheless, most importantly, we are hopeful that it will help you in the time-consuming shopping process.

This tumbler kit is an excellent product manufactured by a reliable company; it is the perfect gift – regardless of the occasion – and the price is on point. What more can you ask?

However, you might want to find out more on the topic beforehand, and this is the purpose of this guide – to offer you the information you need to take up this hobby.

What Are Rocks And How Are They Formed?

Since Earth is a terrestrial planet, this means that it is separated into layers, which have specific rheological and chemical properties. It is in the lithosphere where rocks are formed, and all the changes take place.

Essentially, the forming process depends on the type of rock; and there are three primary types of rocks, namely igneous, sedimentary and metamorphic. Considering that each has a distinct origin, the formation process differs.

Igneous Rocks

To start with, igneous rocks occur as melted rocks cool and, thereafter, solidify. For the most part, melted rocks derive from magma – which is melted rock that is found underneath the Earth’s surface.

At the same time, melted rock might come from lava. This is the result of a volcanic eruption. Some classic examples of igneous rocks include scoria, granite, pumice, and obsidian.

For instance, pumice is the lava derived from melted rock, water, and trapped gas expelled from a volcano during a volcano eruption. Since the ejected material goes through the process of cooling and depressurization really quickly, part of the trapped gas escapes. That leaves gas bubbles and holes in the solidified material.

Sedimentary Rocks

Moving on, sedimentary rocks result from materials and soil components that are cemented into a single rock layer. With the passing of time, the number of materials that settle on the latter layer increases, which leads to the formation of another layer of sediments.

The lower layer experiences significant pressure, due to the weight of the upper layers. This will lead to the formation of sedimentary rocks such as limestone, sandstone, conglomerate, shale, and gypsum.

Interestingly, sandstone forms as a result of the sand and depositions from rivers and beaches. You might find this rock in deltas, considering that this is where rivers flow into the ocean.

Metamorphic Rocks

The term metamorphosis stands for change. That is to say, metamorphic rocks result when other rocks on Earth have undergone extreme heat and pressure. For example, a metamorphic rock might have been sedimentary, igneous, or curiously enough, metamorphic.

The changes take place when the original rocks face extreme temperatures and pressure. Conversely, this might happen if two types of rocks are stuck in the middle of two colliding tectonic boundaries. For instance, marble forms due to the metamorphosis of dolostone and limestone.

What Is Rock Polishing Aka Rock Tumbling?

Rock polishing is the process that involves tumbling the rocks, similar to the way in which Mother Nature transforms rocks over the course of thousands of years. You require a rock tumbler device that turns the barrel round and round for weeks.

The process involves the use of grit and water. The grit is responsible for making the rocks smoother. To be more specific, the grit has to replace the sand that Mother Nature uses for smoothing and polishing the rocks.

The grit has distinct levels of coarseness; therefore, we could associate it with sandpaper. At the beginning of the process, you might want to use a very coarse grit, which will smooth the sharp edges of the rock.

Nonetheless, after a few weeks, you should replace it with a smoother grit until the final stage of the polishing process. Eventually, the rock should be matte when dry and shiny when wet.

Mohs Hardness Scale

A critical factor when it comes to rock tumbling is assessing the hardness of the rock. This is just as important as investing in the best-rated rock tumbler.

A rock’s hardness rating refers to its resistance to being scratched. However, why is this element so important? In lines with the general rock tumbling instructions, you should have the rock polished one week in coarse, one week in medium, another week in fine, and finally, a week in polish.

At least, these rules apply to the most common types or rocks – namely petrified wood, jasper, agate, and quartz. Considering that these materials feature similar hardness ratings, they can easily withstand a whole week of coarse grit.

Nevertheless, let’s say that you intend to polish softer materials such as glass, sodalite, and obsidian. In this scenario, following the general one week rule in coarse grit won’t do. On the opposite, doing so might eventually reduce the rocks to tiny particles – and you don’t want that.

On the other side, hard rocks such as topaz and beryl are worn away at a much slower pace by coarse grit. Thereupon, if you want to obtain a nice rounded shape and a smoothened surface, a week in coarse grit might not suffice.

So, how do you assess the hardness of the rock? Back in 1812, Friedrich Mohs came up with a way of testing the approximate hardness level of a rock or mineral.

Accordingly, the softest rock’s hardness level was of 1. The second softest rock was given a hardness level of 2, whereas the rock with the highest hardness level was given a rating of 10.

For example, the rating for topaz is 8, whereas the rating for marble is 3. The hardness scale developed by the renowned German mineralogist is widely popular till this day – being referred to as the Mohs Hardness Scale.

How To Determine The Hardness Of My Rocks?

If you are serious about rock tumbling, aside from picking the best rock tumbler kit, you should also be careful about the hardness level of the rock. As we explained above, this will aid you to determine the time you should direct for each grit stage.

Kits

For starters, it could be an excellent idea to get a hardness testing kit. This way, you’ll be sure that you’ll obtain the best tumbling results.

There are kits especially created to make the hardness testing as easy and accessible as possible. For example, some kits include special alloys whose goal is to assess the hardness of the minerals, according to the Mohs Scale.

On the other side, there are testing kits that incorporate some of the most commonly used minerals for hardness testing. These kits are just as handy.

Known Materials Scratch Test

Considering that you don’t have a kit at hand, there are some general tips that can be used for determining the hardness level of a rock.

Firstly, a good idea might be to use a penny, whose hardness is of 3.0. If you can manage to scratch the rock with a penny, this merely means that its hardness level is it least the same as it is for calcite – H=3.

Secondly, believe it or not, you might use your fingernail to do some testing as well. If you didn’t know until now, the hardness rating of your fingernail is 2.5 – which is a bit smaller than in the case of a penny.

Therefore, if you manage to scratch a rock by using your fingernail, this could only mean one thing: its hardness level is less than 2.5. That would mean that it is softer than calcite (H=3) and harder than gypsum (H=2).

Thirdly, another viable option would be using a steel blade. Typically, the hardness of a steel blade is roughly 5.5.

In other words, if you don’t manage to do any damage with a penny or with your fingernail, and you do succeed with the steel blade of a knife, then you know for sure that the rock is harder than calcite (H=3) and softer than orthoclase (H=6).

Common Rock Tumbled Materials

If you want to purchase the best rock tumbler for a beginner, the odds are that your knowledge of types of rocks is rather limited. This is why we’d like to briefly present the main rocks that are used for polishing.

However, before we do that, we should tell you what makes a good rock for tumbling. For one thing, it should be hard; softer rocks are rather challenging to polish. As a rule of thumb, rocks whose hardness level ranges from five to seven are most suitable for polishing.

Meanwhile, those that are harder than seven are specifically sturdy. This means that the abrasives will cut them really slowly. So, even if you pick the best rock tumbler, you might not obtain the results you want.

Agate

Without a doubt, agate is the most common rock used for tumbling. It is a translucent material, and it can be found in a wide range of colors. Generally speaking, agate features natural color decorations of clouds, eyes, plumes or mossy formations – this is, in fact, what makes this rock one of a kind.

These specific patterns occur due to the crystallization history of the rock cavities. Another considerable factor is represented by the various types of impurities that are transferred by ground waters.

Thanks to its innate translucence, this grants it an internal glow that outlines its beauty. If you use the best vibratory rock tumbler to polish it, you’ll soon realize why it’s such a popular pick for many hobbyists.

Agate forms when groundwater deposits levels of minerals in rock cavities. To be more specific, it is in the air pockets in andesites, rhyolites, basalts, limestones, and shales where agate might develop. As a rule of thumb, agate tends to withstand weathering better than the rocks in which it is enclosed.

Jasper

Moving on, jasper is another popular choice, as it can be found in a multitude of colors. Generally speaking, though, jasper occurs in shades of gray, white, and earth tones such as brown, orange and yellow. Nonetheless, on some occasions, you can see it in distinct shades of green.

You should know that jasper can withstand a bright polish, being among the most durable polishing materials.

Interestingly enough, jasper is a sub-variety of microcrystalline quartz. Nonetheless, it is not translucent; it has an opaque finishing, being described as semi-translucent. We would recommend beginners or children to start off with jasper, as it is easy to work with it.

Petrified Wood

Petrified wood is definitely worth noting, as well. This type of rock results when woody materials are submerged in an ash fall. Alternatively, this rock could develop as other sedimentary deposits that are afterward replaced by carbonate materials transported by groundwater.

Many times, petrified wood features designs that resemble growth rings, cell walls or other beautiful plant structures.

Even though it would be safe to say that petrified wood isn’t especially abundant, it might be colorful. At the same time, the fact that it preserves different plant structures definitely makes it unique and appealing to rock polishing enthusiasts.

Quartz

And lastly, quartz is, without a doubt, the most abounding mineral present in Earth’s crust. Most of the time, it is found in unusual, yet delightful shapes. It is transparent and the variety of color hues is diverse, which is one of the features that make it so appealing altogether.

Rock tumbling adepts often choose clear quartz, amethyst quartz, rose quartz, or smoky quartz.

Among the most beloved subcategories of quartz, the ones worth mentioning are aventurine and the tiger’s eye. Aventurine is a type of quartz that features inclusions of iron oxide, mica or other minerals. These specific inclusions grant the rock a glittering, shiny appeal when viewed from a given angle.

As for the tiger’s eye, it develops if crocidolite is substituted by quartz. The result is a rock with a fibrous texture, which is distinguished by a silky gloss.

Where Do I Find Rocks To Polish?

There’s no use to look for the best rock tumbler reviews if you don’t have any rocks to polish. And this leads us to a commonly met question: where can you get rocks for this purpose?

Order Online

Essentially, the easiest and most convenient option is ordering them online. The good thing is that almost everything can be ordered online nowadays, which can seriously make our lives easier. This applies when you shop for the best rock tumbler, or when you look for rocks.

Some stores even provide 2-day shipping – so, if you want to get started ASAP, you don’t have to go into the wild and hunt for rocks that seem suitable for tumbling.

Hunting In Nature

The second alternative is looking for them in nature. However, you must know where to look if you want to get any results. Otherwise, you might look in vain.

At the same time, the reason why many people enjoy rock tumbling is the exact process of looking for rocks in natural environments. This can be really thrilling; but, once again, it depends on you.

As we noted beforehand, agate is one of the most popular choices because it’s rather easy to work with. Additionally, you are likely to find it in the Western States – namely Arizona, Oregon, Montana, Wyoming, Michigan and South Dakota.

You should look for them in lakes shores and coastal areas. You might get lucky in the proximity of places that have a past with volcanic activity.

Ideally, you should go to rocky beaches when the tide is low. At times, you might find the agate lying right on top. Still, this isn’t the norm; you might need to start digging since they might be buried among other rocks, as well.

Another type of rock that is fairly easy to hunt is jasper. Once again, you might find it in the Western States in the United States, namely California, Oregon, Washington, Idaho, Arizona, Utah, Arkansas and Texas.

Notwithstanding, as a rule of thumb, if you want to increase your chances of success, you might want to get a guidebook for your area, to check what rocks you’re likely to find. Getting a guidebook might also provide a range of helpful tips on tactics you should use.

How Do I Find Out If My Rock Is A Good Candidate For Tumbling?

Tumbling the first rock that crosses your path isn’t something you can do. In fact, there are specific types of rocks that are compatible with a rock tumbler, while others aren’t. It’s up to you to distinguish between these two categories if you want to make the most out of this hobby.

We’ve already mentioned beforehand that a good tumbling rock should be hard. Therefore, regardless of the way in which you plan on assessing a rock’s hardness level, make sure you do that before placing it in the rock tumbler.

Secondly, another important consideration is to ensure that the rock is dense, without pore spaces and fractures. That’s because pores capture small particles of grit. This means that those particles will be further transferred from one stage of the tumbling process to another one – and you don’t want that.

The contamination of several types of particles will end up ruining the polishing stage. Take it from us – nothing is worse than a beautifully polished rock with coarse grit scratches.

Fractures might lead to other complications. Eventually, they might lead to the breaking of the rock in the tumbler. Plus, the sharp edges that might remain inside will end up scratching other rocks.

Lastly, good tumbling rocks should have a smooth texture, as well. If the surface is grainy or gritty, perhaps you should pick another rock. What is more, if the rock produces debris when rubbed with another rock, it will eventually release grits that might scratch all the rocks you have in the barrel.

How Long Does Rock Tumbling Take?

This depends. It might take two weeks to two months, depending on numerous factors. Of course, the type of rock tumbler you use plays a crucial role in the equation. Essentially, the rock type is just as important.

For example, if you use a rotary tumbler, the polishing process might take from four to eight weeks. Generally speaking, rotary tumblers use a four-step process, as follows: coarse grind, medium grind, fine grind – referred to as the pre-polish step, and, lastly, the polish. Each step lasts a week – at the very least.

On the other side, vibratory tumblers are much quicker than rotary devices. The process may take from one to two weeks, total. It also depends on the rock. Considering that this type of device is much quicker, you might wonder why one should consider getting a rotary tumbler.

For one thing, vibratory tumblers are much pricier than their rotary counterparts – they cost up to 50 percent more. At the same time, a vibratory tumbler smoothens the rock, as opposed to rounding it similar to the way in which a rotary unit does.

As you can see, personal taste and preference is another thing to bear in mind. If you prefer rounded rocks, you should go for a rotary unit. On the opposite, if you are keen on angular rocks, and you want the process to be as quick as possible, a vibratory rock tumbler will do.

Conclusion

On a final note, if you’ve reached the end of this article, you should have the background information required for getting a tumbler. Make sure you read our upcoming article that focuses on answering the question “what is the best rock tumbler?”.

We’ll also introduce you to the best rock tumbler for sea glass, as well as the best unit for children and for beginners. That being said, make sure you check our rock tumbler buying guide if you want to make an informed purchase!

Don’t worry, even if you don’t know anything about this product, our review will shed some light on the subject.

About The Product

Before we proceed with minutely presenting our impression of the product, we’d like to enumerate its primary characteristics. So, why did this unit reach our list?

You get a complete tumbling kit including a tumbler and barrel, 4 grades polishing grits, nine different types of gemstones, jewelry fastenings and learning guide.

The Results

Discover with Dr. Cool is a renowned manufacturer whose focus is to engineer science-orientated products designated for kids. And this is the case with this rock tumbler as well. As the manufacturer puts it, this unit is ideal for children up to fifteen years old.

For starters, you get the complete rock tumbling kit, as mentioned beforehand. This means that the user can commence the geology journey right away. Of course, considering that it is targeted for children, the bright side is that operating it is a breeze.

Still, you should pick the rocks carefully, if you want to obtain great results. Evidently, some rocks will be polished better than others. It’s worth noting that rocks with cavities and pores aren’t appropriate for the process – as this might make them get blocked in the pores.

As for the whole duration of the tumbling process, it takes up to four weeks – more or less. This is the norm for most rotary rock tumblers. Each grade of grit has to be used for roughly one week. Since there are four different grades of grit, in about one month, you should be done.

At the same time, you can attempt to reuse the grit. In time, though, it will get finer, which will require you to replace it eventually.

Since this product is engineered for children, it is surprisingly well-made. Most units that are made for younger users have a toy feel to them. Fortunately, this isn’t the case for this rock tumbler by Discover with Dr. Cool.

Also, due to the rubber barrel, the noise level is significantly reduced. As a word of reference, rubber barrels are much quieter than plastic barrels; so you should bear this in mind when you’re shopping for rock tumblers.

Concurrently, the pre-set duration setting is a great addition. It allows you to program the tumbler for the number of days you’d like for it to run. The fact that you can analyze the transformation process of the rocks is definitely pleasurable and educative, which is the whole purpose of getting a rock tumbler for kids.

What Others Say

Most people specify that this is a fairly affordable rock tumbler that works great for the money. And we couldn’t agree more with this statement. The fact that you get a complete kit is a major plus, especially for the price.

Plus, this is great due to its convenience, as noted by other customers. It was also pointed that the unit is easy to clean and maintain, whereas the noise level isn’t too harsh. On a different note, the noise and vibration released are influenced by the type of rock or gemstone you introduce in the barrel.

Simultaneously, other users noted that this can be used by adults as well – which is nice to know. Therefore, if you’re looking for an affordable unit for beginners, this one might be a decent pick.

What We Liked

We really like that this unit offers a fantastic price-quality ratio. At the same time, we would say that it is a suitable choice for both beginners who don’t want to spend a small fortune on a rock tumbler and children.

Also, it operates surprisingly quietly – primarily due to the leak-proof lid and premium rubber. It doesn’t come with a lot of bells and whistles, but it does the job. It is the right equipment if you want good results.

What We Didn’t Like

It will be a while till we’ll manage to find the perfect product – if you found it, do let us know. That is to say, this unit, although it is a great purchase, has a small design flaw.

To be more specific, we noticed that the belt spinning the tumbler has the tendency to come off, which could be rather annoying.

Buying Advice

The manufacturer offers a 100 percent satisfaction guarantee, as well as a 2-year warranty. As for the price point, this unit costs less than $100.

If you’re lucky – like we were when we placed the order on Amazon, you’ll obtain a discount as well. We got a 5 percent price reduction plus free shipping.

Final Thoughts

To conclude, we wanted to include the most important points about the Discover with Dr. Cool Hobby Rock Tumbler and we are confident that we’ve reached this goal. Once again, we’d like to outline that this unit is great for children, but beginners might find it a nice piece of equipment to start with.

At the end of the day, it doesn’t make sense to invest a large sum of money before you know for sure that you’re genuinely interested in rock polishing.

Still, you don’t have to do that, considering that we’ve done all the legwork for you. Our reviews aim at objectively presenting the item’s features, while outlining our personal experience with it.

Without further ado, let’s see whether the National Geographic Professional Rock Tumbler is worthy of your attention or not!

About The Product

If you prefer choosing a rock tumbling kit over a rock tumbler, then you might have found your pick – this unit by National Geographic comes with everything you need to get started. Aside from that, here are the main product specs.

The kit includes one pound of rough gemstones, jewelry fastenings, four polishing grits, information guide, and instructions.

The Results

There are many reasons why this unit has come to our attention. For starters, it definitely offers a nice mixture of unique features. For one thing, the automatic shut-off timer might come in handy whenever you are away.

Considering that the rocks have reached the right tumbling process, the unit will simply automatically shut off. That being said, since few people have the time to keep on monitoring the tumbling stage, this feature can be really helpful.

Moving on, thanks to the speed control feature, you may pick the desired tumbling speed. This way, you can anticipate when it’s likely to finish the job.

Essentially, we find that the inclusion of one pound of rough gemstones is more than welcome. This will give you a great start on things, meaning that you can begin using the tumbler right away – as opposed to looking for rough stones to polish.

Furthermore, we consider that the noise-reduction design is an excellent innovation. Evidently, this doesn’t mean that you won’t hear this unit operate. All rock tumbling units are loud – this comes with the territory.

Nevertheless, this unit is definitely quieter than others, which is a pro. That is to say, considering that your garage insulation is decent, you might not even hear it tumble round the clock.

Since you also get jewelry fastenings, this means you can use them for your first jewelry making projects – considering that you’re just starting off. Who knows, perhaps this will motivate you to discover an innate talent for jewelry making?

At the same time, we find that the leak-proof, high-impact design plays a crucial role in maximizing the durability of the item. Therefore, you should get a lot of use out of this product, if you utilize it accordingly.

A thing worth noting is that even though the manufacturer advises seven to 10 days for polishing, you can only set the timer for up to five days. This means you’ll need to reset the timer.

On the other side, the rubber and metal lid is a tad challenging to remove. Still, once you get the hang of it, there shouldn’t be any problems. 

What Others Say

According to former customers, this unit is excellent for beginners, even children. The fact that it comes as a complete starter kit is quite appealing, as well.

At the same time, customers outlined that the unit does a decent job at polishing all types of rocks, which is the mere purpose of getting such a machine, right?

On the other hand, it appears that some customers received defective products. That means that there might be an issue with the quality control stage of the items. Perhaps the manufacturer should do something in this respect, to minimize the likelihood of sending out defective units.

What We Liked

The thing we liked most about this rock tumbler is the fact that it has some great advanced features. It goes without saying that the speed variation and timer are its most notable characteristics, allowing you to fully customize the operation of the machine.

Secondly, the leak-proof design of the barrel does a decent job at preventing water from getting in during the operation. Novice hobbyists will also find the included educational pamphlet really helpful, as it presents a wide range of details regarding different rocks and tumbling techniques.

Although there’s no rocket science there, it’s nice to have all the information in one place.

What We Didn’t Like

A potential disadvantage of this unit is that closing and opening the rubber and metal lid is a bit of a challenge – at first, at the very least. In time, though, it should get easier.

Plus, the fact that some customers received defective units is a bit disappointing, considering the legacy of the manufacturer.

Buying Advice

Depending on your budget, you might think that this unit is either on the affordable or on the expensive side. We believe that it is fairly priced, since it does have a nice set of features. If you order it on Amazon, you pay less than $150, plus free shipping.

On a different note, though, National Geographic offers a 100 percent satisfaction guarantee, as well as a 2-year warranty.

Final Thoughts

So, if you’re on the lookout for a high-quality rock tumbler that would do the job effortlessly, it’s needless to say that the National Geographic Professional Rock Tumbler fits the description. Evidently, this isn’t a perfect unit, but it comes pretty close to being one.

Thanks for reading so far, and make sure you leave your thoughts and impressions of the product if you’ve already used it!

That being said, if you are clueless regarding the rock polishing device you should pick, perhaps our review of the Tru-square Metal Products Heavy Duty Rotary Tumbler will guide you in the right direction.

We’ll briefly present the main characteristics of the item to make sure that you make an informed purchase.

About The Product

As the name already implies, the product we’re about to present to you is a rotary tumbler. What does this mean? When you use this kind of machine, you place rough rocks in the barrel; from that point onward, the barrel will continually rotate the rocks, while smoothing the edges.

As a rule of thumb, when you shop for a rotary tumbler, you’ll get rounded rocks. This makes such an item more than ideal for jewelry making.

At the same time, beginners might find rotary tumblers suitable, because they are easier to use than their counterparts – vibratory tumblers. Now that we’ve clarified that, let’s have a look at the key features of this product, shall we?

The Results

To start with, this is a unit that indicates high-quality and first-rate craftsmanship. We specifically like that it is suitable for the majority of rock tumbling applications. To be more specific, the 15-pound capacity will accommodate the needs of most hobbyists.

For instance, smaller units are capable of shaping rocks whose diameter is of one inch. Nevertheless, if you’re serious about your tumbling goals, we believe that this unit will meet, if not surpass, your expectations – as it did in our case.

After conducting a series of tests with this unit, we could wholeheartedly recommend it to all rock polishing hobbyists out there and collectors. It might be appropriate for equipping schools and laboratories, as well – considering the durable build of the item.

Additionally, it is engineered so that it can accommodate all types of rocks – which is always an advantage. At the same time, it is quite easy to operate, which would make it a suitable investment for both beginners and more advanced users.

Moving on, we were definitely keen on the motor’s powerful operation. Nonetheless, carry in mind that the speed setting isn’t variable – this could be a source of disappointment for some users, but still, it’s nothing major.

Also, as we tested the tumbler with rocks of different sizes, we determined that one shouldn’t place rocks whose diameter is larger than three inches. In this respect, the rule of thumb is to avoid adding rocks that are larger than half of the barrel’s diameter. So, regardless of the product you pick, you should keep this rule in mind.

You should also remember that the barrel must always be filled at least ½ to 2/3 full capacity. In the case in which you don’t have sufficient tumbling material, you might consider getting ceramic media to compensate.

On the other side, you must note that this isn’t a rock tumbling kit – meaning that you need to buy all the additional accessories separately. This could be an inconvenience to some people; however, we find that for the quality of the item, the price is on point.

At the same time, the fact that you need to purchase grit isn’t too bad. It merely means that you can fully customize the equipment you purchase depending on your personal applications.

What Others Say

Evidently, customer reviews can indicate whether a product is worth the purchase or not. This is why we took the time to scan through reviews, and, for the most part, we’ve noticed that most people are happy with the product.

It appears that not only is this unit suitable for rock tumbling, but many people use it for polishing brass. Therefore, if you need a unit for this application as well, then you might have found your pick.

As for its general rating on Amazon, it is above 4 stars, which could only mean that we’re dealing with a high-quality unit. Most people outline that the unit is reliable and is likely to bring the anticipated results. The fact that it is sturdy and well-built is often mentioned in reviews.

On the other side, some users believe that the motor is underpowered for a 15-lbs capacity. Additionally, the fact that it is rather noisy to operate is widely agreed upon.

What We Liked

As we’ve pointed beforehand, this product comes with a nice set of features. The overheat protection is definitely a plus, ensuring that the motor doesn’t fail.

At the same time, the rubber liner facilitates easy cleaning, which is just as important. Of course, the item’s durable construction is worth mentioning, as well.

What We Didn’t Like

Moving on to the not so good things about this unit: it is, as former customers outlined, rather noisy. Therefore, it is pretty mandatory to use it in the garage, or any other well-insulated place – unless you’re a fan of the noise. What is more, if you don’t handle them accordingly, the side plates are prone to bend.

Buying Advice

Amazon is usually the site where we place online orders. And we did the same for this rotary tumbler. At the time of the purchase, we got free shipping and a 32 percent discount, which is not too bad.

Final Thoughts

All things considered, this is a great unit that is likely to address the needs of most rock tumbling hobbyists. It does the job, it has a sturdy construction, and you may use it for a wide variety of tumbling applications. If you’ve already tested this unit, do share your thoughts with us in the comment section!