--- product_id: 34238823 title: "National Geographic Hobby Rock Tumbler Kit for Kids and Adults Ages 8+" brand: "blue marble" price: "€ 241.55" currency: EUR in_stock: true category: "Blue Marble" url: https://www.desertcart.hr/products/34238823-national-geographic-hobby-rock-tumbler-kit-for-kids-and-adults store_origin: HR region: Croatia --- # 4 polishing grits for gem-quality shine 75% quieter leakproof barrel Durable motor, built to last National Geographic Hobby Rock Tumbler Kit for Kids and Adults Ages 8+ **Brand:** blue marble **Price:** € 241.55 **Availability:** βœ… In Stock ## Summary > πŸ’Ž Polish your passion, rock your world! ## Quick Answers - **What is this?** National Geographic Hobby Rock Tumbler Kit for Kids and Adults Ages 8+ by blue marble - **How much does it cost?** € 241.55 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/34238823-national-geographic-hobby-rock-tumbler-kit-for-kids-and-adults) ## Best For - blue marble enthusiasts ## Why This Product - Trusted blue marble brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Set It and Forget It:** One-touch timer with automatic shutoff makes tumbling effortless. - β€’ **Award-Winning Quality:** From the Toy of the Year winner, trusted for inspiring imagination. - β€’ **Whisper-Quiet Operation:** Enjoy a 75% noise reduction for peaceful creativity. - β€’ **Complete STEM Learning Kit:** Includes 9 real rough gemstones and a full-color guide for immersive education. - β€’ **Transform Rough Rocks into Dazzling Gems:** Turn everyday stones into polished treasures with ease. ## Overview The National Geographic Hobby Rock Tumbler Kit is a durable, quiet, and easy-to-use STEM activity designed for kids 8+ and adults. It includes a high-quality motorized tumbler, four polishing grits, nine types of rough gemstones, and a detailed learning guide, enabling users to transform rough stones into sparkling gems. Recognized for educational value and awarded Toy of the Year, this kit combines fun, science, and creativity in one complete package. ## Description Buy 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: Rock Tumblers - desertcart.com βœ“ FREE DELIVERY possible on eligible purchases ## 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! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01LQCIL88 | | Age Range Description | 8 years and up | | Best Sellers Rank | #2,099 in Toys & Games ( See Top 100 in Toys & Games ) #1 in Kids' Rock Tumblers | | Brand Name | Blue Marble | | Customer Reviews | 4.5 4.5 out of 5 stars (25,883) | | Educational Objective | STEM | | Global Trade Identification Number | 00816448020421 | | Included Components | Complete Rock Tumbling Kit | | Item Dimensions | 13.81 x 4.88 x 8.06 inches | | Item Type Name | Rock Tumbler Kit – Hobby Edition | | Item Weight | 5.1 pounds | | Manufacturer | JMW Sales, Inc | | Manufacturer Maximum Age (MONTHS) | 1188 | | Manufacturer Minimum Age (MONTHS) | 96 | | Manufacturer Part Number | NGHOBBYTUMBLER | | Manufacturer Warranty Description | No Warranty | | Material Type | Plastic | | Model Number | NGHOBBYTUMBLER | | Number of Items | 1 | | Number of Packs | 1 | | Set Name | Hobby | | Size | One Size | | Sub Brand | National Geographic | | Theme | Rock Tumbling | | UPC | 816448020421 | | Unit Count | 1 Count | ## Images ![National Geographic Hobby Rock Tumbler Kit for Kids and Adults Ages 8+ - Image 1](https://m.media-amazon.com/images/I/91yg3JBdlgL.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 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 - 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.hr/products/34238823-national-geographic-hobby-rock-tumbler-kit-for-kids-and-adults](https://www.desertcart.hr/products/34238823-national-geographic-hobby-rock-tumbler-kit-for-kids-and-adults) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-08-12*