National Geographic Hobby Rock Tumbler Kit for Kids and Adults Ages 8+ | Rough Gemstones, 4 Polishing Grits, Rock Polisher, Geology Science Kit, Rock Tumbling for Kids and Adults, Birthday Gift
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Availability:
Only 5 left in stock, order soon!
Arrives
Saturday, Aug 8
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Style: Hobby Kit
Features
- CREATE YOUR OWN GEMSTONES - Make any stone sparkle and polish everyday rocks into dazzling gemstones! This rock tumbler kit makes it fun and easy to turn rough rocks into beautifully polished gemstones, thanks to its simple operation and durable design.
- A TUMBLER THAT'S MADE TO LAST Our high-quality tumblers are made with a durable motor thats designed to last for years. The leakproof rubber barrel reduces sound, making it 75% quieter than other plastic models. An excellent STEM activity for kids.
- A COMPLETE HOBBY TUMBLING KIT - Everything you need to create polished gemstones: the tumbler, four polishing grits, sifter, nine types of real rough gemstones, plus a detailed full-color learning guide. Makes a great gift for girls and boys!
- EASY TO USE Simple instructions and one-touch settings make rock tumbling fun and easy. Control the number of days for each tumbling cycle with the one-touch timer and automatic shutoff feature, set it and forget it! This is a great gift for kids.
- AWARD-WINNING PRODUCTS - Blue Marble, winner of the Toy Association's prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with a U.S. support team to ensure a stellar experience!
Description
Your purchase has purpose! Every purchase helps support the global nonprofit National Geographic Society in its work to protect and illuminate our world through exploration, research, and education. Includes everything you need to create polished gemstones: the tumbler, four polishing grits, sifter, nine types of real rough gemstones, plus a detailed full-color learning guide. Makes a great gift for girls and boys! This Hobby Rock Tumbler Kit from National Geographic includes all the accessories you’ll need to start polishing dazzling gems. Kids can use the included jewelry fastenings to create beautiful homemade jewelry! This high-quality tumbling machine boasts a powerful motor that will last for years; an automatic shutoff timer; and a noise-reducing, leak-proof barrel with stainless steel lid. Plus, everything is included to get started: a 1/2 pound of assorted stones from around the world, 4 stages of polishing media, and jewelry fastenings to you can create your own unique wearables with your tumbled gems. Rock tumbling is a fun activity for children of all ages and promotes an interest in geology and science! Join National Geographic as we inspire future generations by showing them the wonders of the natural world. We make the highest quality hands-on science toys, and all products are backed by exceptional service. With a mission to inspire people to care about the planet, the National Geographic Society is one of the world's largest nonprofit scientific and educational organizations.
Brand Name: Blue Marble
Age Range Description: 8 years and up
Educational Objective: STEM
Sub Brand: National Geographic
Set Name: Hobby
Manufacturer Maximum Age (MONTHS): 1188
Number of Packs: 1
Number of Items: 1
Unit Count: 1 Count
UPC: 816448020421
Manufacturer Minimum Age (MONTHS): 96
Global Trade Identification Number: 21
Included Components: Complete Rock Tumbling Kit
Item Type Name: Rock Tumbler Kit – Hobby Edition
Model Number: NGHOBBYTUMBLER
Manufacturer: JMW Sales, Inc
Manufacturer Part Number: NGHOBBYTUMBLER
Manufacturer Warranty Description: No Warranty
Theme: Rock Tumbling
Material Type: Plastic
Size: One Size
Item Dimensions: 13.81 x 4.88 x 8.06 inches
Item Weight: 2.3 kg
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Aug 8
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: Hobby Kit
High quality rock tumbler made out of strong plastic and metal. The tumbler jar is made of rubber so it is quieter than most and will last a long time. It is a good beginners tumbler with a pretty small tumbling jar. I wish it was bigger. A nice set it and forget it mentality. You push the button for duration and it stops when the time is up. I took it out of the box and used it. not too much set up. It comes with a screen and all the grit you will need for one batch.
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Reviewed in the United States on April 30, 2026 by Theodore Stradinger
Style: Hobby Kit
I originally purchased this in March 2024. I used it pretty regularly for 9 months and it worked wonderfully and I loved the results I got with my rocks. I paused using it for a few months and when I tried to start tumbling some rocks again, the tumbler would barely start moving and then would stop all together. Opening it up and cleaning it up seemed to help for a few minutes but then it would stop again. I opened it again and the connections all seemed fine but I wondered if the motor was just worn out. I contacted the manufacturer Think Blue Marble and they immediately replied to my email saying that it sounded like it was a weight sensor issue. They offered to send me a one time replacement free of charge! I provided my address and within 72 hours of my initial email I had received a brand new natgeo tubmler set in the mail! 100 stars for amazing customer service and standing behind their product! I'm just about to finish up the first stage in this new tumbler. Thank you Think Blue Marble!!
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Reviewed in the United States on June 23, 2025 by Emily Sanders
Style: Hobby Kit
Are you wondering if it works well? It does! Any problems? None! Results? Incredible, I was truly shocked! Pros: Almost no assembly, at all. Extremely easy to understand the directions (Tumbling time will vary depending on the rocks. Don't let it scare you away when it says one phase should tumble for 6-8 days (I haven't had to tumble any that long! The longest has been 3 days). That being said, an extremely hard rock that's very jagged may need more time. Using the rocks they include, or your own collection of crystals/gemstones is a great route. A plain piece of gravel or a rock of that type is very hard and dense and may take more time (who wants polished gravel anyway though?) Extended project to do with children, lots of engagement. Because their are 4 different grit types with different purposes, the children get to return to their project, dump the rocks and check on the progress and start a new phase. It's a great opportunity to teach to teach about erosion, and show / explain what a rock looks like through millions of years of erosion and then further explain how incredible it is that we are doing this project together that mimics what nature does, we are polishing these rocks in a few weeks that takes millions of years to do in nature! It's a wonderful learning opportunity for children, as well as an extremely engaging project that although it may take quite some time for it to finish, the ongoing project itself is what makes it fun. Returning to the rocks and seeing the progress, (we actually started taking pictures each time we open it so then we can look back on the pictures and see how the rocks have changed!). I cannot say enough how great of a project this is for children to get them excited about science! Personally, I find this to be very satisfying regardless of children. This would be an extremely fun hobby for an adult as well, the above is not to say that this is a children only experience. Use or find or buy your own natural gemstones or softer rocks (look in River beds if you can!). Tumble them, polish them, and then make your jewelry or just save them to display. It's quite a satisfying feeling to see the project from beginning to end, and to know that the beautiful smooth shiny rocks were not store-bought, but that you did this with that with this machine! Cons: I've been through the tumbling process in full, twice now. I honestly cannot think of any cons at this point. It's not to say that no one has had issues, but the machine I received functions perfectly and I have had no issues with leaks or ill-fitting pieces, tearing of the belt or anything of this nature. I did take a very small amount of oil on my fingertip and lightly rub it on the belt to keep it lubricated, with the constant friction I could see how the belt can eventually wear down just like any other belt of this nature whether it's in a car or in a fan. So, keeping it very slightly lubricated will help with the health of the band. Should it break, the kid includes an extra belt and it is incredibly easy to repair, the belt is divisible and an outside piece of the equipment you simply take one off and put the other on there is no sophisticated way of connecting the belt, it is truly something my six-year-old could do with almost no instruction, so an adult will have zero issues with that! If you are interested in rock tumbling, or you just want a very fun project for your children to stimulate their interest in science or to just keep them busy using their imaginations (regarding the possibilities of what to do with the rocks, and imagining whether it will look like and the brilliant colors!) - then this is absolutely a perfect kit to start with. DO: Make sure to not put too many rocks. I've never filled mine more than one third of the way, and I wouldn't recommend doing more than that. The amount of rocks you can tumble at a time will vary depending on the size, but I also recommend not doing anything smaller than a dime because during the tumbling process it could crack and chip. I would also recommend not doing anything larger than a half dollar as well (height and width, and that'd be on the largest size). Remember, this is just the hobby edition. I do have to say though, the results are quite sophisticated for just a hobby edition! All in all, it's an excellent piece of equipment to buy if you're interested in rock tumbling but are unsure if you would stick to it or are not ready to spend a few hundred dollars on a professional Tumbler. ** I did read a few comments about the machine leaking, I have not had this problem at any point. Make sure you are putting on the inner lid correctly, as well as the top lid, then turning the black lid securing piece as tightly as possible. If you do end up having problems, I highly recommend exchanging instead of giving up, because I really have seen that it works and I just want everyone who wants to try this to have the experience I've had! It's been great fun. Wonderful purchase, no regrets!
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Reviewed in the United States on May 26, 2023 by Marie
Style: Hobby Kit
It's a really cool tumbler, but it has to stay on for DAYS at a time, all day long. We don't have a garage, so it's extremely annoying and loud. You need 4 different types of special grit to be able to use it, it comes with one pouch of each, however you will have to be constantly buying supplies if you want to use it for more than a couple of runs. If you can get past the noise and constantly replenishing the grit then it might be worth it.
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Reviewed in the United States on July 23, 2026 by Daniela Loera
Style: Hobby Kit
I am on my last grit of my first round of rocks. I have to say that the results are beating my expectations. I found some rocks at a park and mixed them in with the ones that were shipped with the kit. I can't tell the difference between them. They are all turning out amazing. I would definitely recommend this product. I will say that a piece stopped working, but i contacted National Geographic and they fixed the issue immediately. I'll say that i will not fault a company for a faulty part, but it's how they handle it determines how the product is. Their customer service is amazing. They responded very quickly. Things you have to keep in mind when using a rock tumbler. This process normally takes years and years, i think a few weeks in a tumbler is just fine. It's all part of the process and fun. It is a little loud. I had to put it outside, but it sounds like rocks tumbling in water like you would expect. If you put in brittle rocks, they will fall apart. I'm not going to try to tumble limestone. I would imagine that sedimentary rocks would fall apart more easily. Good rocks in my area are quartz and granite. Finding the right type of rocks to tumble is half of the fun! I'll try to remember to add photos when it's all done.
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Reviewed in the United States on February 5, 2018 by NathanG
Style: Hobby Kit
I bought this for my son for Christmas. He's really interested in geology, so I thought that this would be a great way to encourage that interest, add some excitement and show him just how beautiful rocks can really be. I'm very glad I chose this rock tumbler. There were others that were cheaper, but after careful consideration of several reviews and ratings, this one stood out. The machine is very easy to use. The instruction book that's included provides simple directions for use and everything seemed to be labeled so that it was all quite easy to put together and use within minutes. The only thing my son couldn't manage himself was getting the lid on and off because it's so tight (which is a good thing if you don't want leaks!). I was a bit skeptic, since it takes nature so many years to accomplish such beauty, but my son and I placed the rocks, grit and water into the container and set it for our first run. Surprisingly, after just using the first grit, the rocks look amazing! We had even added some that he'd found on our evening walks around the neighborhood and we couldn't believe how they turned out! Again, that was after just the one week's worth of time (168 hrs) with the first grit. The only downfall is that the machine really needs to run constantly for each of the polishing periods, which some might consider long. It can be difficult since it's pretty loud. His dad absolutely hates how loud it is and doesn't want it to be running at night, so we had to break up our run time. That resulted in it taking us two weeks to get our "7-day" results. We were satisfied with those results for now, so we haven't yet done the next round of grit and run time. So far, this machine does exactly what I expected of it. Yes, it's loud, but it's not nearly as loud as some of the other machines out there. I imagine that is due to the rubber container. In addition, the included rocks are a great way to get your kids excited about geology! We're now planning a summer rock-hunting adventure so that we can really utilize this rock tumbler and some of the other new tools we have at our disposal. For the record, the one and only reason I would give this rock tumbler less than 5 stars is because it's loud. But you know what? Rocks banging together are not quiet in nature, so I don't expect any different when they're in a man-made machine. You shouldn't either. Oh, and anyone thinking that rock tumblers take too long (or something you might tell your kids when they complain that it's taking too long)...patience is a virtue. Consider how long it took for that rock to form in the first place, and be thankful that you have a machine at your disposal to make your finds look amazing in a minute percentage of the time that it took nature to create them.
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Reviewed in the United States on May 16, 2017 by MotherCreative
Style: Hobby Kit
This is definitely marketed more towards kids, but I have an obsession with all things rocks and couldn’t help myself. When you add rocks to this tumbler, it makes them smaller, smoother and more portable. Plus, they just look so cute! I’ve used it constantly for about a year now and it’s still running smoothly! It is a little loud, keep it outside or in your garage or you’ll never sleep, trust me I used to keep it in my bathroom! The package comes with step by step instructions that are easy to follow. The tumbler itself is super beginner friendly, and you don’t need any previous knowledge to operate one. The kit comes with starter powder for each cycle, a tumbler and stand, starter rocks, and cool stuff you can put your rocks in like keychains and necklaces. You will need to order more powder for the different cycles if you plan on using it more than a few times, but they sell it in a giant pack of four for the refills, so you won’t run out anytime soon. You can tumble all different sizes of rocks as well. I’ve experimented a lot with different timings and different sizes, but a general rule of thumb is bigger sizes need more time, smaller need way less. If you want to tumble a super small rock, it might be best to skip the first 2-3 cycles and just run the last 1-2 on half the recommended length so you don’t completely erode your rock. The shrinkage kinda just depends on the composition of your rock, so do your research before tumbling if you’re worried! The rocks pictured above were mostly hardened GA clay with a little bit of rock here and there, and were each originally the size of a kid’s fist, but i’ve had others the same size that barely shrank at all because they were made from harder materials!
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Reviewed in the United States on March 22, 2024 by Julie Greenwood
Style: Hobby Kit
I haven’t seen a review (yet) that’s mentioned using this rock tumbler to tumble/smooth sea/beach glass.. so here’s mine & I hope this helps someone out there :) If you’re interested.. I’ve collected so much glass over my years of searching on Lake Erie. Majority of my glass is smooth or frosted over (chef’s-kiss kinda pieces), but of course I have not as-smooth pieces too. I know people say “it’s not ready,” but IMO, it’s ready if my bag is open and it’s not a literal shard of glass lol. Anyways. I’ve heard of people DIYing their own “sea” glass. I FINALLY purchased this, after 2 years of just thinking about getting one. Here’s how I feel about it (using beach glass, not rocks): So far, I’ve been using it almost night & day for about 1-2 weeks. 100/10. If you don’t have a basement, garage, or shed with an outlet, just know it’s a loud & noisy thang! It does wonders for my unfinished beach glass! I only left those pieces in the tumbler for 10-12 hrs (I believe), and they’re perfect now!! Lastly, we listen and we don’t judge: I didn’t read too far into the “what’s included” section, so I was honestly just expecting the tumbler 😂. I love that it came with necklace options, the rocks themselves, an extra rubber- chain(?), and the 4 grit packets. You certainly get your money’s worth. If you made to the end, thanks for taking the time to learn more! :)
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Reviewed in the United States on January 5, 2026 by Baylee DeFazio