Blue Marble National Geographic Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with Any Rock Polisher, Rock Tumbler Supplies
JMW Sales, Inc.
17962 ratings
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1
Product Features
- HIGH QUALITY - This rock polisher grit refill pack comes with enough high-quality silicon carbide grit to put a dazzling polish on up to 20 lbs. of rocks, gems, glass, and more
- EASY TO USE FOUR-STAGE ROCK GRIT - The first rock tumbling grit stage provides initial shaping, the second smooths rock surfaces, the third pre-polishes rocks, and the fourth provides the final polish
- COMPATIBLE WITH ALL TUMBLERS - This complete 4-step rock tumbler grit refill kit works with all rock tumblers. For best results, use with National Geographic Rock Tumblers and rock tumbling supplies
- EASY TO MEASURE AND STORE - Each rock tumbling grit stage is packaged in a wide-mouth container with secure, screw-top closure.
- 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!
National Geographic Rock Tumbler Refill Kit – 1 Lb. Gemstones & Rocks for Tumbling Including Unpolished Amethyst and Quartz – Rock Tumbler Supplies, Rock Tumbler Grit, Jewelry Accessories
JMW Sales, Inc.
5933 ratings
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2
Product Features
- GEMSTONES OF 9 VARIETIES - Tiger's Eye, Amethyst, Aventurine, Rose Quartz, Red Jasper, Agate, Sodalite, Dalmatian Jasper, Hematite (1 lb. total)
- FOUR GRADES OF GRIT - Coarse, medium, fine, polish. Transform your stones from rough rocks to dazzling gemstones!
- JEWELRY FASTENINGS - 1 necklace, 1 set of earrings, 1 keychain, 1 ring. Create custom jewelry from your newly polished gemstones!
- DETAILED LEARNING GUIDE - Our learning guide will teach you all about these unique gemstone specimens and includes many amazing and fascinating facts.
- 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!
National Geographic Rock Tumbler Kit - 3 Lb. Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Kit Includes Rocks for Tumbling and Rock Polisher Grit, Rock Tumbler for Adults and Kids
JMW Sales, Inc.
4727 ratings
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3
Product Features
- CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This professional 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 has time and speed control settings so you can set it, and forget it. An improved, leak-proof barrel features a stainless-steel lid is 75% quieter overall than plastic tumbler barrels.
- INCLUDES 3 LBS. OF ROCKS & MORE - This tumbling kit comes with everything you need: 3 lbs. of raw rocks with 9 types of gemstones, 5 jewelry fastenings, grit, strainer & GemFoam for a dazzling shine!
- USE GEMFOAM FOR DAZZLING RESULTS - This rock tumbler kit stands apart from others thanks to our new, reusable GemFoam rock polisher! Add GemFoam and water to the barrel after your final tumbling stage and your gems will have incredible shine!
- 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!
KomeStone K2 Elite Professional Rock Tumbler Kit, Ultra Quiet & Cutting Edge Brushless Motor Rock Polisher for Adults & Rock Collector, Noise-Reduction, Extra Large 3 Lbs Barrel, STEM Gift for All Age
KomeStone
550 ratings
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4
Product Features
- 𝟗𝟎-𝐃𝐚𝐲 𝐒𝐚𝐭𝐢𝐬𝐟𝐚𝐜𝐭𝐢𝐨𝐧 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞 & 𝟏-𝐘𝐞𝐚𝐫 𝐖𝐚𝐫𝐫𝐚𝐧𝐭𝐲: Enjoy peace of mind with our extended 90-day refund guarantee and 1-year warranty. If you miss Amazon's 30-day return window, simply contact our 𝐔𝐒-𝐛𝐚𝐬𝐞𝐝 𝐜𝐮𝐬𝐭𝐨𝐦𝐞𝐫 𝐬𝐞𝐫𝐯𝐢𝐜𝐞 team for 𝐡𝐚𝐬𝐬𝐥𝐞-𝐟𝐫𝐞𝐞 𝐫𝐞𝐩𝐥𝐚𝐜𝐞𝐦𝐞𝐧𝐭 𝐨𝐫 𝐫𝐞𝐟𝐮𝐧𝐝 𝐚𝐬𝐬𝐢𝐬𝐭𝐚𝐧𝐜𝐞. We offer 𝟐𝟒/𝟕 𝐜𝐥𝐚𝐢𝐦 𝐬𝐮𝐩𝐩𝐨𝐫𝐭 to ensure your complete satisfaction.
- DIVE INTO THE FUN ROCK TUMBLING: KomeStone rock tumbler is for turning rough raw rocks into smooth gemstones. You’ll be excited to see the rocks change with each cycle—a great lesson in patience for kids or inspiration for jewelry-making moms.
- 2025 NEW UPGRADE & ADVANCED FEATURES: This K2 Elite rock tumbler stands out as the sole option to feature a cutting-edge brushless motor and noise-reduction function among high-end models. This makes it an ideal choice for users sensitive to noise and those who prefer tumbling indoors, even in smaller or shared spaces. Additionally, you'll appreciate the benefits of receiving original manufacturer and brand-direct troubleshooting support, as well as lifetime accessory replacement services.
- 3 LBS EXTRA LARGE CAPACITY & ULTRA QUIETER: Our rock tumbler features 100% soft rubber barrels that effectively absorb the impact of tumbling rocks, resulting in an ultra-quiet operation comparable to a working dishwasher. The generously-sized 3 lbs barrel allows you to polish a larger quantity of rocks in each batch.
- COMES WITH EVERYTHING YOU NEED FOR ROCKS TUMBING: Including the tumbler machine, 3 lbs barrel, 1 lb rough rocks, 1 extra belt (2 in total, one is on the wheel), 4 polishing grits and other accessories. Notably, it also includes a full-color instruction book that provides detailed and easy-to-follow guidance. Even an 8-year-old child can independently learn how to use it with clarity.
- SCIENCE-BACKED POLISHING FOR PRO-LEVEL RESULTS: Achieve museum-quality shine with our 4-stage grit system (60/120/150/1200) and precision ceramic media. The leak-proof stainless steel lid ensures mess-free tumbling, while our exclusive guide unlocks pro techniques.
Blue Marble National Geographic Rock Tumbler Kit – Hobby Edition Includes Rough Gemstones, and 4 Polishing Grits, Great STEM Science Kit for Geology Enthusiasts, Rock Polisher for Kids and Adults
JMW Sales, Inc
28692 ratings
More info
5
Product 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 that’s 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!
KomeStone K1 Pro Professional Cutting-Edge Brushless Motor Advanced Rock Tumbler Polisher Kit, Extra Large 2.5Lb Barrel with 3-Speed Motor 9-Day Timer, 6 Belts, Rough Gemstones, 4 Polishing Grits etc.
KomeStone
3030 ratings
More info
6
Product Features
- 𝟗𝟎-𝐃𝐚𝐲 𝐒𝐚𝐭𝐢𝐬𝐟𝐚𝐜𝐭𝐢𝐨𝐧 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞 & 𝟏-𝐘𝐞𝐚𝐫 𝐖𝐚𝐫𝐫𝐚𝐧𝐭𝐲: Enjoy peace of mind with our extended 90-day refund guarantee and 1-year warranty. If you miss Amazon's 30-day return window, simply contact our 𝐔𝐒-𝐛𝐚𝐬𝐞𝐝 𝐜𝐮𝐬𝐭𝐨𝐦𝐞𝐫 𝐬𝐞𝐫𝐯𝐢𝐜𝐞 team for 𝐡𝐚𝐬𝐬𝐥𝐞-𝐟𝐫𝐞𝐞 𝐫𝐞𝐩𝐥𝐚𝐜𝐞𝐦𝐞𝐧𝐭 𝐨𝐫 𝐫𝐞𝐟𝐮𝐧𝐝 𝐚𝐬𝐬𝐢𝐬𝐭𝐚𝐧𝐜𝐞. We offer 𝟐𝟒/𝟕 𝐜𝐥𝐚𝐢𝐦 𝐬𝐮𝐩𝐩𝐨𝐫𝐭 to ensure your complete satisfaction.
- DIVE INTO THE FUN ROCK TUMBLING: KomeStone rock tumbler is for turning rough raw rocks into smooth gemstones. You’ll be excited to see the rocks change with each cycle—a great lesson in patience for kids or inspiration for jewelry-making moms.
- 2025 K1 PRO - PROFESSIONAL-GRADE TUMBLING INNOVATION: Experience the future of rock tumbling with our K1 Pro's cutting-edge features: a smart LCD screen with 9-day programmable timer, 3 precision speed settings, and pause/resume function for ultimate control. The brushless motor delivers 20,000+ hours of quiet operation, while our military-grade thickened rubber barrel withstands years of continuous use. Create custom polishing recipes for museum-quality gemstones – innovation that puts hobbyists in the professional league.
- 2.5 LB EXTRA LARGE CAPACITY & QUIETER: We use the 100% soft rubber barrels which can absorb the impact of the tumbling rocks and it’s 75% quieter than that of other plastic drums, which likes the sound of a working dishwasher. With 2.5lbs extra large barrel, that means you can polish more rocks at once than 1 lb drum.
- COMES WITH EVERYTHING YOU NEED: Including the tumbler machine, the barrel, 1lb rough rocks, 6 belts, 4 polishing grits and ceramic filler media (As a gift in package) and other accessories, etc. Especially the full-color Instruction book, detailed and clear to follow, even a 4 year old kid knows how to use it independently.
- SCIENCE-BACKED POLISHING FOR PRO-LEVEL RESULTS: Achieve museum-quality shine with our 4-stage grit system (60/120/150/1200) and precision ceramic media. The leak-proof stainless steel lid ensures mess-free tumbling, while our exclusive guide unlocks pro techniques.
C1 Rock Tumbler Kit - Professional Large 2.5LB Capacity, Up to 5X More Noise Cancelling, Adjustable Timer & Speed with Full Accessories & Memory Function, Ideal for Adults Kids
KoolStone
2387 ratings
More info
7
Product Features
- 1 Year 𝐖𝐚𝐫𝐫𝐚𝐧𝐭𝐲 - Special Bonus Just for You! The 𝐰𝐚𝐫𝐫𝐚𝐧𝐭𝐲 covers accessories replacement, techical support, 𝟐𝟒/𝟕 𝐜𝐥𝐚𝐢𝐦 𝐡𝐨𝐭𝐥𝐢𝐧𝐞 and so on. 𝐌𝐚𝐤𝐞 𝐲𝐨𝐮𝐫 𝐦𝐨𝐧𝐞𝐲 𝐰𝐨𝐫𝐭𝐡 𝐞𝐯𝐞𝐫𝐲 𝐩𝐞𝐧𝐧𝐲.
- START A TUMBLING JOURNEY -- C1 Rock Tumbler turn rough rocks into polished gems, then you will be very excited to see the stones change with each cycle. That's a fun process of rock tumbling and a family little project for parent-child endeavor.
- 2.5LB LARGE CAPACITY & 75% QUIETER -- An updated features is that KoolStone Rock Tumbler has a large 2.5LB capacity. Which allows to tumbler more rocks each time. Another improvement is the quieter barrel. Rubber material which has 75% quieter than most plastic barrel.
- FASTER POLISHING TIME & BETTER POLISHING RESULTS -- 3-speed controls (providing more granular tumbling results), a 9-day timer (with automatic shutoff feature and memory function), all displayed on clear screen, letting you easily hone your settings for precise tumbling each time.
- EVERYTHING YOU NEED FOR TUMBLING IS HERE -- C1 Rock Tumbler has everything you need to create polished gemstones. Rock tumbler, 2.5LB capacity rubber barrel, 1LB for 9 different types of rough gemstones, 6 belts and 4 polishing grits and ceramic contact media, sifter, jewelry fastenings, and illustrated tutorial guide. Just tumbling right away!
NATIONAL GEOGRAPHIC Starter Rock Tumbling Kit - Durable Leak-Proof Polisher for Kids Complete Geology Hobby Science Kit, Rocks and Crystals Kids, A Great STEM Activity
Discover with Dr. Cool
10773 ratings
More info
8
Product 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 ½ 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.
- HIGH-QUALITY EDUCATIONAL TOYS - We're proud to make the highest quality hands-on science toys, and all our products are backed by exceptional service. If your experience is less than stellar, let us know and we'll make things right!
C1 Pro Ultra Brushless Rock Tumbler Kit - Double Barrel for Extra Large 7LB Capacity, Up to 6X More Noise Cancelling, Quiet Rotary Polisher with Full Accessories, Professional Edition for Adults
KoolStone
53 ratings
More info
9
Product Features
- The FIRST and ONLY double barrel & brushless motor rock tumbler available on the market. 𝐖𝐞'𝐝 𝐥𝐢𝐤𝐞 𝐭𝐨 𝐬𝐞𝐧𝐝 𝐲𝐨𝐮 𝐚 𝐞𝐱𝐭𝐫𝐚 𝐛𝐚𝐠 𝐨𝐟 𝐫𝐨𝐮𝐠𝐡 𝐬𝐭𝐨𝐧𝐞𝐬 𝐭𝐨 𝐲𝐨𝐮 𝐡𝐚𝐯𝐞 𝐚 𝐛𝐞𝐭𝐭𝐞𝐫 𝐭𝐮𝐦𝐛𝐥𝐢𝐧𝐠 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞, 𝐩𝐥𝐞𝐚𝐬𝐞 𝐤𝐢𝐧𝐝𝐥𝐲 𝐫𝐞𝐚𝐜𝐡 𝐨𝐮𝐭 𝐭𝐨 𝐮𝐬 𝐭𝐨 𝐠𝐞𝐭 𝐢𝐭. ( 𝐰𝐨𝐫𝐭𝐡 𝟏𝟓𝐔𝐒𝐃).
- 1 Year 𝐖𝐚𝐫𝐫𝐚𝐧𝐭𝐲- Special Bonus Just for You! The 𝐰𝐚𝐫𝐫𝐚𝐧𝐭𝐲 covers accessories replacement, techical support, 𝟐𝟒/𝟕 𝐜𝐥𝐚𝐢𝐦 𝐡𝐨𝐭𝐥𝐢𝐧𝐞 and so on. 𝐌𝐚𝐤𝐞 𝐲𝐨𝐮𝐫 𝐦𝐨𝐧𝐞𝐲 𝐰𝐨𝐫𝐭𝐡 𝐞𝐯𝐞𝐫𝐲 𝐩𝐞𝐧𝐧𝐲.
- CUTTING-EDGE BRUSHLESS MOTOR, UNMATCHED IN THE MARKET -- C1 Pro Ultra rock tumbler boasts an unbeatable brushless motor, providing lightning-fast and highly effective tumbling action that leaves your gems and rocks polished to perfection. We take pride in being the pioneers of the brushless motor rock tumbler, currently the first and only one available on the market.
- 7LBS CAPACITY & 6X QUIETER-- Features a dual barrel design with a total capacity of 7lbs, allowing you to tumble more rocks simultaneously for efficient results. Enjoy a tranquil tumbling experience with the noise-reduction cover, which makes operations quieter than ever. It's perfect for enthusiasts who prefer tumbling indoors or have limited space. Additionally, the rubber barrel reduces noise by 75% compared to plastic barrels.
- EXPEDITED POLISHING AND SUPERIOR RESULTS - With the 4-speed controls for precise tumbling and a 9-day timer with automatic shutoff and memory function, all displayed on a clear screen. Additionally, our exclusive feature, the Polishing Cycle Record Button, allows users to track and manage their polishing cycles efficiently.
- EVERYTHING YOU NEED FOR GEMSTONE POLISHING RIGHT AT YOUR FINGERTIPS -- The KoolStone Rock Tumbler includes a complete set of tools required for creating exquisite polished gemstones. Unbox and discover the rock tumbler itself, equipped with two 3.5LB capacity rubber barrel, 2LB of rough gemstones in 9 different varieties, 2 durable belts, 8 types of polishing grits, a sifter, mesh strainer and ceramic pellets,along with jewelry fastenings and an illustrated tutorial guide. Start tumbling right away!
KomeStone Ultra Quiet Brushless Rock Tumbler Kit – 7lb Capacity Dual-Barrel with Noise-Canceling Cover, Up to 6× Quieter, Include All Accessories, Professional Rock Polisher for Adults & Gift Giving
KomeStone
30 ratings
More info
10
Product Features
- 𝐍𝐞𝐞𝐝 𝐞𝐱𝐭𝐫𝐚 𝐛𝐞𝐥𝐭𝐬 𝐨𝐫 𝐬𝐭𝐨𝐧𝐞𝐬 ($𝟑𝟎 𝐯𝐚𝐥𝐮𝐞)? Reach out after purchase for free spares - to keep your tumbling running at its best.
- 𝟏-𝐘𝐞𝐚𝐫 𝐖𝐚𝐫𝐫𝐚𝐧𝐭𝐲 & 𝟗𝟎-𝐃𝐚𝐲 𝐌𝐨𝐧𝐞𝐲-𝐁𝐚𝐜𝐤 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞: Enjoy peace of mind with our extended 90-day refund guarantee and 1-year warranty. If you miss Amazon's 30-day return window, simply contact our 𝐔𝐒-𝐛𝐚𝐬𝐞𝐝 𝐜𝐮𝐬𝐭𝐨𝐦𝐞𝐫 𝐬𝐞𝐫𝐯𝐢𝐜𝐞 team for 𝐡𝐚𝐬𝐬𝐥𝐞-𝐟𝐫𝐞𝐞 𝐫𝐞𝐩𝐥𝐚𝐜𝐞𝐦𝐞𝐧𝐭 𝐨𝐫 𝐫𝐞𝐟𝐮𝐧𝐝 𝐚𝐬𝐬𝐢𝐬𝐭𝐚𝐧𝐜𝐞. We offer 𝟐𝟒/𝟕 𝐜𝐥𝐚𝐢𝐦 𝐬𝐮𝐩𝐩𝐨𝐫𝐭 to ensure your complete satisfaction.
- Ultra Quiet Operation with Brushless Motor & Noise-Canceling Cover: Powered by a next-generation brushless motor, the KomeStone K4 delivers smooth, stable operation with a lifespan of over 20,000 hours—equivalent to over 10 years of weekly use. Paired with our custom noise-canceling cover and dual rubber barrels, this rock tumbler kit is up to 6× quieter than others. Compared to plastic-barrel models, it reduces noise by up to 75%, making it ideal for homes, classrooms, and shared spaces.
- 7lb Dual-Barrel Capacity for Polishing More at Once: This dual-barrel rotary tumbler handles up to 7 pounds of rocks in one cycle—perfect for polishing coarse and fine grit simultaneously. Whether you’re restoring gemstones or prepping materials for jewelry, this stone polisher offers high-volume performance in a compact footprint, great for hobbyists, crafters, and serious collectors.
- Precision Control with 4 Speeds & 9-Day Timer: The digital panel gives you full control over every stage. Choose from 4 speed levels, program up to 9 days, and enjoy features like auto shutoff, memory recall, and a polishing progress log. Ideal for repeatable, hands-free use, this polishing machine delivers consistent results with zero guesswork.
- Complete STEM Kit with Full Accessories for Kids & Adults: Everything you need is included: 2 lbs of assorted rocks, 8 polishing grits, ceramic pellets, jewelry findings, belts, strainer, and a colorful step-by-step guide. Great for beginners and seasoned tumblers alike, this STEM-friendly rock tumbler kit is perfect for kids, parents, educators, and DIY enthusiasts.
- U.S.-Based Support, 1-Year Warranty, Lifetime Help: Your purchase is backed by KomeStone’s commitment to customer satisfaction. We offer a 1-year warranty covering free replacement of all accessories, plus lifetime technical support from our dedicated U.S.-based team. Whether you’re using this quiet rock tumbler for agates, gemstones, or jewelry polishing, we’re here every step of the way—ensuring peace of mind for beginners and pros alike.
- Spare Belt Support – We're Always Here to Help: The belt may wear out for long-term use. If it breaks or if you’d like to keep spares on hand, feel free to reach out anytime after purchase—we’ll be happy to send you some extras.
