--- product_id: 319966455 title: "National Geographic Rock Tumbler Grit and Media Refill with 1.36 kg Rocks" brand: "blue marble" price: "€ 118.24" currency: EUR in_stock: true category: "Blue Marble" url: https://www.desertcart.hr/products/319966455-national-geographic-rock-tumbler-grit-and-media-refill-with-1 store_origin: HR region: Croatia --- # 680 g ceramic media for noise reduction & breakage control 1.36 kg authentic Madagascar rocks 4-stage silicon carbide grit polishing system National Geographic Rock Tumbler Grit and Media Refill with 1.36 kg Rocks **Brand:** blue marble **Price:** € 118.24 **Availability:** ✅ In Stock ## Summary > ✨ Transform Rough Rocks into Radiant Treasures 🪨 ## Quick Answers - **What is this?** National Geographic Rock Tumbler Grit and Media Refill with 1.36 kg Rocks by blue marble - **How much does it cost?** € 118.24 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/319966455-national-geographic-rock-tumbler-grit-and-media-refill-with-1) ## 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 - • **Ceramic Media Magic:** Enhance your tumbling efficiency—reduce noise, minimize rock breakage, and optimize grit distribution for flawless results. - • **Revolutionary GemFoam Polish:** Add the patent-pending GemFoam for an unprecedented, dazzling shine that sets your polished stones apart. - • **Precision 4-Stage Polishing Grit:** Master the art of rock tumbling with silicon carbide grit that shapes, smooths, pre-polishes, and delivers a mirror finish. - • **Premium Madagascar Rock Assortment:** Experience the thrill of polishing 1.36 kg of genuine rose quartz, jasper, and more—rocks you’ll proudly showcase. - • **Complete Kit with Jewelry Accessories:** Turn your polished gems into stylish gifts or personal keepsakes with included fastenings and a detailed learning guide. ## Overview The National Geographic Rock Tumbler Refill Kit offers 1.36 kg of authentic Madagascar rocks combined with a comprehensive 4-stage silicon carbide grit system, 680 g of ceramic media to improve tumbling efficiency, and the innovative GemFoam polishing media for superior shine. Designed for enthusiasts aged 8 and up, this all-in-one kit includes jewelry fastenings and a learning guide, making it perfect for both educational and creative pursuits. Compatible with all tumblers, it’s a premium refill pack that elevates your rock tumbling experience with quality materials and expert-backed instructions. ## Description NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit - Rock Tumbling Supplies including Grit and Polish Refills, Ceramic Media, GemFoam, 1.36 kg Madagascar Rocks for Tumbling, Jewellery Accessories : desertcart.co.uk: Home & Kitchen ## Features - POLISH INCREDIBLE ROCKS FROM MADAGASCAR - You'll have plenty of tumbling to do with 1.36 kilograms of rocks from Madagascar. This rock refill pack can include rose quartz, jasper, and more. It's an awesome assortment of rocks you will treasure forever! - HIGH QUALITY – This rock polisher grit refill pack comes with enough high-quality silicon carbide grit to put a dazzling polish on approximately 4 kilograms of rocks, gems, glass, and more - IMPROVE YOUR ROCK TUMBLING RESULTS – Ceramic tumbler media makes the entire rock tumbling process more effective, improving delivery of rock tumbling grit, quieting tumbler noise, reducing rock breakage, and acting as a filler for smaller batches - BRAND NEW WAY TO MAKE TUMBLED ROCKS SHINE – GemFoam is a unique new rock polisher media that gives unprecedented shine to tumbled rocks. Just add the patent-pending rock polishing media to your tumbler after the final grit cycle for great results! - 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! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08B7JBVG9 | | Age Range Description | 8 years and up | | Best Sellers Rank | 90,149 in Toys & Games ( See Top 100 in Toys & Games ) 737 in Educational Science Kits | | Brand Name | Blue Marble | | Colour | Multicolor | | Country Of Origin | China | | Customer Reviews | 4.6 4.6 out of 5 stars (896) | | Educational Objective | Develops fine motor skills, patience and following instructions | | Global Trade Identification Number | 00816448027505 | | Included Components | 1.36 kg Madagascar Rocks, Ceramic Media, Patented Polishing GemFoam, Rock Tumbler Grit and Polish Refill | | Is Assembly Required | No | | Item Dimensions | 25 x 18 x 14 centimetres | | Item Type Name | Complete Rock Tumbler Refill Kit | | Item Weight | 3 Pounds | | Manufacturer | JMW Sales, Inc. | | Manufacturer Part Number | NGFOMCERGRTMD | | Manufacturer Warranty Description | We're proud to make the highest quality products which are backed by exceptional service. | | Manufacturer recommended age | 8 - 12 years | | Material Type | Ceramic | | Model Number | NGFOMCERGRTMD | | Number of Packs | 1 | | Number of Players | 1 | | Operation Mode | Manual | | Power Source | Manual | | Set Name | Polishing Kit | | Supported Battery Types | No batteries required | | Theme | Gemstone Tumbling Media | | UPC | 816448027505 | | Unit Count | 1.0 count | ## Product Details - **Brand:** Blue Marble - **Colour:** Multicolor - **Special feature:** GemFoam - **Style:** Complete Starter Kit - **Theme:** Gemstone Tumbling Media ## Images ![National Geographic Rock Tumbler Grit and Media Refill with 1.36 kg Rocks - Image 1](https://m.media-amazon.com/images/I/91d7DbkcfYL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: How many oz is in each container?** A: 1 Coarse-16oz. 2 Medium-13oz. 3 Pre-polish-12oz. 4 Polish-11.5 oz. **Q: I just opened this and finished with grit one, went to put grit 2 in and bottle open and 1/2 full. How do I contact seller?** A: I would go through Amazon to get an answer for your problem. **Q: Can it be used together ?** A: Each grit is a different fineness intended for a specific purpose. We do not recommend using them at the same time. We do recommend 1 TBS grit per per 1 LB rocks, at each cycle. For further information please contact us at help@natgeotoys.com. **Q: After each step for the rocks in the kit, my rocks dry with a dull white finish. It doesn't show when it is wet. Am I doing something wrong?** A: No. I find that after tumbling with the finest grit after the last step... and thoroughly allowing the rocks to dry, a nice coat of wax or oil brings out the color beautifully. ## Frequently Bought Together - NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit – Rock Tumbling Supplies including Rock Tumbler Grit and Polish Refill, Ceramic Media, GemFoam, 3 lbs Madagascar Rocks for Tumbling, Jewelry Accessories - 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 - National Geographic Rock Tumbler Refill Kit – 3 lbs. of Rough Gemstones and Rocks for Tumbling Including Amethyst and Quartz – Rock Tumbler Supplies Include Rock Tumbler Grit and Jewelry Accessories --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/319966455-national-geographic-rock-tumbler-grit-and-media-refill-with-1](https://www.desertcart.hr/products/319966455-national-geographic-rock-tumbler-grit-and-media-refill-with-1) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-11-02*