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Blue Marble

National Geographic Starter Rock Tumbler Kit - Durable Leak-Proof Rock Polisher for Kids - Complete Tumbling Kit with Rocks & Crystals (Amazon Exclusive)

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Availability: Only 5 left in stock, order soon!
Fulfilled by Amazon
Arrives Thursday, Aug 20
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Features

  • CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This starter rock tumbler 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 - The durable motor allows you to tumble multiple batches of rocks. An improved, leak-proof barrel is lined with rubber for quieter operation while tumbling on the sturdy tumbler base.
  • ALL-IN-ONE TUMBLING KIT - This kit has everything you need and then some! You get 12 a pound of rough rocks with nine different types of gemstones inside, five jewelry fastenings, and our four-stage rock polishing grit.
  • EASY TO USE AND EDUCATIONAL - Detailed tumbler instructions lead you step-by-step through the rock tumbling process, A full-color learning guide details how rocks are naturally polished and has fascinating facts about the gemstones in the kit.
  • 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

Visit the Store Visit the Store Visit the Store Visit the Store Visit the Store Visit the Store Visit the Store Visit the Store Visit the Store 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. Dive into the exciting hobby of rock tumbling with this complete starter kit that includes a tumbler, ½ pound of rough rocks with 9 types of gems, 5 jewelry fastenings & 4-stage rock polishing grit. This kit has all the features and accessories you’ll need to transform rough rocks into extraordinary gemstones, start an awesome rock collection, and create beautiful jewelry. This high-quality tumbling machine boasts a powerful motor that will last for years, as well as an upgraded leak-proof, rubber-lined barrel. Plus, everything is included to get started: a 1/2 pound of assorted stones from around the world, 4 stages of polishing media, and five jewelry fastenings to you can create your own unique wearables with your tumbled gems. This high-quality beginner tumbler makes rock tumbling easy for kids and adults, with detailed, easy-to-follow instructions that will have you successfully tumbling in no time! The rough rocks provided (½ lb.) contain nine different gemstones from around the world, and our tumbling grit is labeled by tumbling stage to make the process even easier! Choose your favorite gems and turn them into jewelry with the included necklace, key chain, ring, and two clip-on earring fastenings inside. This is a great way to inspire a love of a hobby that can last a lifetime! Plus, kids are astounded by the transformation they'll see once rocks are fully polished! It's also a fantastic STEM toy thanks to the detailed Learning Guide, where kids can learn how rocks are smoothed and polished over time in nature. They'll also discover fascinating facts about all the gemstones in the kit! 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. Starter Rock Tumbler Kit Hobby Rock Tumbler Kit Professional Rock Tumbler Kit Skill Level Beginner Skill Level Hobby Skill Level Advanced Capacity 1 lb. Capacity 2 lb. Capacity 3 lb. Controls Plug in to Tumble Controls 7-day Programmable Timer Controls Speed Control and Programmable Timer Rough Gemstones Included 1/2 lb. Rocks Rough Gemstones Included 1/2 lb. Rocks Rough Gemstones Included 3 lb. Rocks Extras Patented GemFoam included for a shinier finish.

Brand: Blue Marble


Age Range (Description): 8 years and up


Color: Multicolor


Theme: Geology


Item dimensions L x W x H: 10.98 x 5.2 x 12 inches


Brand Name: Blue Marble


Age Range Description: 8 years and up


Included Components: 5 Jewelry Fastenings, Four Levels of Grit, Leak-proof, Rubber-lined Tumbler Barrel, Rock Tumbler, ½ Pound of Stones


Model Name: Complete Rock Tumbling Hobby Kit


Art Craft Kit Type: Rock Polishing


UPC: 816448020391


Global Trade Identification Number: 91


Set Name: Necklace, Key chain, Ring, Two clip-on earring fastenings


Manufacturer: JMW Sales, Inc.


Manufacturer Part Number: NGTUMBLER2


Model Number: NGTUMBLER2


Warranty Description: We're proud to make the highest quality products which are backed by exceptional service.


Item Type Name: Complete Rock Tumbling Kit - Geology Hobby Science Kit, Rocks and Crystals for Kids, A Great STEM Activity


Unit Count: 1.0 Count


Color: Multicolor


Theme: Geology


Product Style: Modern


Subject Character: Rock Tumbling, Gemstones


Item Dimensions: 10.98 x 5.2 x 12 inches


Item Weight: 1.9 Kilograms


Size: 1 Count (Pack of 1)


Number of Pieces: 30


Material Type: Rubber


Additional Features: Spill-Proof


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Aug 20

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.

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Top Amazon Reviews

    • Great but hard to close
This is a great product, however it is extremely hard to open and close the cylinder. My grandson could not open or close, nor could I. Actually, there war two men who could not get it closed. We had to ask someone who was much stronger and he struggled…. But it does a great job once you get it closed. I took it to my mechanic and had him open it for me the last two times….lol Probably just look at the draw. ... show more
Reviewed in the United States on February 23, 2026 by Bob
    • Everything you need
Just got my hands on the national geographic starter rock tumbler kit and I'm absolutely stoked! this thing is a beast, turns rocks into sparkly crystals like a pro (or, like, a kid, lol). it's a bit loud, but hey, it's worth it - just toss it in the garage and let it do its magic. what i love most is that it comes with everything you need to get started - no extra purchases necessary! the leak-proof design is a total win, too. all in all, this thing is a solid 5 stars - perfect for the little geologists out there (or, you know, the slightly-bigger geologists like me)! ... show more
Reviewed in the United States on January 3, 2025 by TRED
    • Really fun and great for kids of all ages! Really fun and great for kids of all ages!
Review Image by mapagill
Review Image by mapagill
Review Image by mapagill
My second grade students became interested in rock tumbling this year after another student brought in their collection. Soon they started collecting rocks on the playground. I knew I had to capitalize on their excitement, so I found this kid friendly rock tumbler. First things first, it is AMAZING. It comes with everything you need, including cool rocks ready to tumble, although you’ll probably need to restock the grinding powders if you’re going to do multiple sets like we have. A few things to note: It is hard to open and close. Have someone strong on hand to do it, because I struggle to do it myself. It is LOUD. I mean, it’s rocks tumbling in a jar. Of course it’s loud. But find someplace to set it up near a plug because it’s going to be distracting otherwise. In the classroom, we stuffed it in a cabinet - still made noise but muffled it enough that we could still focus. At home, we did it on the back porch. I’m sure the neighbors could hear it on quiet nights, but oh well. As long as you muffle it, it’ll sound like a white noise. Last but not least, this process takes a lot of TIME! About a month from start to finish. Be patient. The good news is that aside from opening it, filling it, and plugging it in, there’s minimal upkeep. You just leave it alone and let the tumbler do its job. Opening it every week was the highlight of our week. The process is so cool even after just the first cycle. It’s so worth the time it takes. Don’t drain it in your sinks. The gunk will mess up your pipes. After the last cycle, the rocks won’t be fully polished. We bought some mineral oil and polished them ourselves for a nice sheen. Worth the additional extra few bucks. After school let out, I brought it home to do it again with my toddlers. They loved it just as much as the big kids. I would recommend this to any future geologist in the making! ... show more
Reviewed in the United States on July 4, 2023 Reviewed in the United States on July 4, 2023 by mapagill
    • Great gift for kids
Got as a gift for nephew age 8. He loves rocks and digging so naturally a rock tumbler was a go to gift. Needs some help from his dad to change the grit powder but regardless loves the final results of shiny rocks.
Reviewed in the United States on June 18, 2026 by Scott
    • Bought for 6 year old
Amazing rock tumbler—turned rough stones into gorgeous polished gems! This tumbler is a total winner for beginners and hobbyists alike. It runs super quietly (barely noticeable even in the living room), stays cool during long cycles, and the barrel seals perfectly—no leaks or mess. I followed the standard 4-6 week process with the included grit/polish steps, and the results are stunning: dull, jagged rocks came out mirror-shiny and smooth. Easy to use and clean, the motor is strong and consistent—no stalling with a full load. Great build quality for the price—feels durable and reliable. My family loves checking the progress every week, and now we have a beautiful collection of tumbled stones for jewelry and display. If you’re into rockhounding or just want a fun, satisfying project, this is fantastic. Highly recommend! ... show more
Reviewed in the United States on January 29, 2026 by Nichole
    • Neat and fun to do, but SO NOISY
Our first rock tumbler. at this time, I've only done the rocks that the set came with and used all the grit provided. I have to purchase more grit before I can do rocks that we have personally collected. I am waiting though. Why? Because this thing sounds like a rainstorm in my garage. Yes, I had to keep it in my garage because of the noise level. It is so loud. That is a bummer. Also, it's showing wear and tear already and I have literally ONLY done the rocks it came with. By the time I got to grit 2, I noticed bubbles in the inner liner. When I'd clean it out after a tumble, I'd push the nasty grit mud out of the bubbles and next time, there'd be another bubble in a different location. I've only had it 2-3 months, so I hope this is not indicative of the lifespan of the tumbler. Once that liner starts cracking or breaking, it will no longer function well. Hopefully, the bubbles will not escalate into anything else. Finally, the lid gets harder and harder to remove with time. The first two grits, I could remove it by hand. For grit 3, I had to get my strong teen son to do it...By grit 4, he had to use a jar opener and barely got it open. we try to clean it well between tumbles to ensure no gunky mud build up is present, but that made no difference in our ability to open the container. Pros: Great start up kit for the price, with several good items included; Seemed to accomplish it's purpose of prettying up the rocks. Cons. THE NOISE. IT IS LOUD. Wear and tear on kit after just a couple tumbles and increasing difficulty with opening lid. I won't buy this particular model again...but I would still recommend it to others for a first time tumbler. My kiddos love what it can do and loved the final product. ... show more
Reviewed in the United States on October 31, 2020 by Angelsmom
    • Don't use to big of rocks
Very easy to use and my 10 year old grandson loves it.
Reviewed in the United States on June 5, 2026 by Brandi Peralez
    • Great
Grandson loves it and I love helping him with it.
Reviewed in the United States on June 9, 2026 by Tom C.

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