--- product_id: 655664852 title: "Blue Marble NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Durable Leak-Proof Polisher With 7-Day Timer - Complete Tumbling Kit - Geology Hobby for Kids, Educational STEM Science Kit, Collection" brand: "national geographic" price: "Β₯64963" currency: JPY in_stock: true category: "National Geographic" url: https://www.desertcart.jp/products/655664852-blue-marble-national-geographic-hobby-rock-tumbler-kit-durable-leak store_origin: JP region: Japan --- # 9 gemstone varieties included leak-proof stainless steel barrel 7-day automatic timer Blue Marble NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Durable Leak-Proof Polisher With 7-Day Timer - Complete Tumbling Kit - Geology Hobby for Kids, Educational STEM Science Kit, Collection **Brand:** national geographic **Price:** Β₯64963 **Availability:** βœ… In Stock ## Summary > πŸ’Ž Turn rough stones into polished gemsβ€”and your next conversation starter! ## Quick Answers - **What is this?** Blue Marble NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Durable Leak-Proof Polisher With 7-Day Timer - Complete Tumbling Kit - Geology Hobby for Kids, Educational STEM Science Kit, Collection by national geographic - **How much does it cost?** Β₯64963 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/655664852-blue-marble-national-geographic-hobby-rock-tumbler-kit-durable-leak) ## Best For - national geographic enthusiasts ## Why This Product - Trusted national geographic brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **GemFoam Magic:** Reusable polishing foam for a dazzling, professional shine - β€’ **STEM Meets Style:** Educational geology kit that transforms rocks into wearable art - β€’ **Leak-Proof & Quiet:** Durable barrel with stainless steel lid reduces noise and mess - β€’ **Set It & Forget It:** 7-day timer with auto shut-off for effortless polishing - β€’ **All-In-One Starter Kit:** Includes 1/2 lb assorted stones, polishing grit, and jewelry fastenings ## Overview The Blue Marble National Geographic Hobby Rock Tumbler Kit is a durable, leak-proof polisher featuring a 7-day automatic timer and noise-reducing barrel. It includes 1/2 pound of assorted rough stones with nine gemstone types, four polishing grits, innovative reusable GemFoam for extra shine, and jewelry fastenings to create unique wearable pieces. Designed for ages 8+, this STEM-focused kit combines hands-on geology education with creative craftsmanship. ## Description Turn rough stones into amazing gems with the Hobby Rock Tumbler Kit! This rock tumbler set has all the features and accessories you need to master rock drums, start an exceptional rock collection, and create beautiful jewelry. This high quality drum machine features a powerful motor that will last for years, a power-saving automatic shut-off timer and a noise-reducing, leak-proof run. Plus, everything is included to get started: a 2lb assorted stones from around the world, 4 levels of polishing media and jewelry attachments. You can create your own unique wearables with your tumbled stones. It also contains GemFoam, the most innovative way to give your polished stones a dazzling shine. With this high quality tumbler, you can set your drum time. When the time is up, your tumbler will automatically shut off, allowing you to choose the perfect amount of drying time for each grit level. Plus, our drum barrel dampens the sound better than most tumblers. The included rough stones (2 pounds) contain nine different gemstones from around the world, and our drum grain is labeled through tumbling phase to make the process even easier! Pick your favorite gemstones and turn them into jewelry with the included necklace, keychain, ring and two clip-on earring backs inside. And don't forget GemFoam, our exclusive new way to give your polished stones a dazzling shine. Use GemFoam just like drum grains, simply add it to the barrel with your stones and water and then marvel at the shine three days later. GemFoam is also reusable, allowing you to create a truly impressive gemstone collection. We make the highest quality scientific toy, and all products are backed by exceptional service. With a mission to inspire people to take care of the planet, the National Geographic Society is one of the world's largest non-profit scientific and educational organizations. ## Features - CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This robust rock polisher 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. - ALL-IN-ONE TUMBLING KIT - You get 1/2 pound of rough rocks with nine different types of gemstones inside, five jewelry fastenings, tumbler grit, a strainer, and our innovative new GemFoam polishing foam. - USE GEMFOAM FOR DAZZLING RESULTS - This rock tumbling 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! - HIGH-QUALITY EDUCATIONAL TOYS - We proudly make the highest quality hands-on science toys, and all our products are backed by exceptional service. If your experience isn't stellar, we'll make it right! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B086Z6ZB7R | | Age Range Description | 8 years and up | | Battery Description | Not required (mains powered) | | Best Sellers Rank | #111,852 in Toys & Games ( See Top 100 in Toys & Games ) #2,756 in Science Toys & Kits | | Brand | National Geographic | | Customer Reviews | 4.3 4.3 out of 5 stars (3,643) | | Educational Objective | STEM | | Included Components | 1/2 Pound of Assorted Stones from Around the World, 4 Stages of Polishing Grit Media, Easy-to-Follow Instructions, Full-Color Learning Guide, GemFoam Polishing Media, High-Quality Rock Tumbler, Jewelry - Necklace, Key Chain, Ring, and Two Clip-on Earring Fastenings, Noise-Reducing, Leak-Proof Barrel | | Is Assembly Required | No | | Item Dimensions | 33.3 x 12.7 x 20.7 Centimeters | | Item Type Name | Hobby Rock Tumbler Kit | | Item Weight | 1.9 Kilograms | | Language | German | | Manufacturer | JMW Sales, Inc. | | Manufacturer Part Number | NGHOBBYTUMBLER2 | | Manufacturer recommended age | 8 years and up | | Material | Multiple | | Model Number | NGHOBBYTUMBLER2 | | Number of Items | 1 | | Number of Packs | 1 | | Set Name | Hobby Rock Tumbler Kit | | Size | Medium | | Sub Brand | National Geographic | | Theme | Geology | | UPC | 816448028830 | ## Product Details - **Age Range (Description):** 8 years and up - **Brand:** National Geographic - **Item dimensions L x W x H:** 33.3 x 12.7 x 20.7 Centimeters - **Size:** Medium - **Theme:** Geology ## Images ![Blue Marble NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Durable Leak-Proof Polisher With 7-Day Timer - Complete Tumbling Kit - Geology Hobby for Kids, Educational STEM Science Kit, Collection - Image 1](https://m.media-amazon.com/images/I/915PyUpEsJL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: What is the power consumption of this unit over a week of continuous use? (in usa on 110v). thank you.** A: This takes .3 Amps, so (watts = amps x volts) OR watts = .3 x 110 which equals33 watts. Now for one week would equal 33 watts x 7 days x 24 hours =5544 watts or 5.54 kilowatts for one week.At $.16 per kilowatt it comes to $.89 per week. **Q: What the difference between this and the starter kit?** A: There are two main differences:The Hobby Rock Tumbler has a rubber tumbling barrel with a stainless steel cap, which reduces noise and is more durable. The Starter Kit Rock Tumbler has a plastic barrel. The Hobby Rock Tumbler also has a keypad for setting the number of days you would like it to tumble, where as the Starter Kit Rock Tumbler's setting options are on/off. Thank you for your inquiry. **Q: What pound tumbler is this product?** A: Dearest National Geographic.... why would you only send 1# of rocks with a two pound tumbler? **Q: Can i buy extra grit without the rocks. we have many rocks from "mining" gemstones that i would love to polish. what do you recommend?** A: I recommend you follow the rock tumbler hobbiest MIchigan Rocks on Youtube. He's a good wealth of information for anyone getting into rock tumblers. He and other's mention that the polish from National Geographic is not good. I would go with rock tumbler polish offered by Polly Plastics. ## Frequently Bought Together - NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit – Durable Leak-Proof Rock Polisher with 7-Day Timer – Complete Rock Tumbling Kit – Geology Hobby for Kids, Educational STEM Science Kit, Rock Collection - 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 - NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit – 1Lb. Gemstones and Rocks for Tumbling including Unpolished Amethyst and Quartz – Rock Tumbler Supplies include Rock Tumbler Grit and Jewelry Accessories --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/655664852-blue-marble-national-geographic-hobby-rock-tumbler-kit-durable-leak](https://www.desertcart.jp/products/655664852-blue-marble-national-geographic-hobby-rock-tumbler-kit-durable-leak) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-21*