--- product_id: 47945287 title: "National Geographic Starter Rock Tumbler Kit with Grit and Rocks" brand: "blue marble" price: "¥31763" currency: JPY in_stock: true category: "Blue Marble" url: https://www.desertcart.jp/products/47945287-national-geographic-starter-rock-tumbler-kit-with-grit-and-rocks store_origin: JP region: Japan --- # 4-stage silicon carbide grit for flawless polish Comprehensive learning guide for STEM mastery Metal & rubber-lined barrel for durable, quiet tumbling National Geographic Starter Rock Tumbler Kit with Grit and Rocks **Brand:** blue marble **Price:** ¥31763 **Availability:** ✅ In Stock ## Summary > 💎 Transform Rough Rocks into Polished Gems & STEM Brilliance! ## Quick Answers - **What is this?** National Geographic Starter Rock Tumbler Kit with Grit and Rocks by blue marble - **How much does it cost?** ¥31763 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/47945287-national-geographic-starter-rock-tumbler-kit-with-grit-and-rocks) ## 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 - • **Polish Like a Pro:** 4-stage silicon carbide grit ensures museum-quality shine on your gemstones - • **STEM-Driven Discovery:** Includes an engaging learning guide to boost critical thinking and geology skills - • **All-in-One Creativity Kit:** Comes with rough gemstones plus jewelry fastenings to craft your own wearable art - • **Built to Last & Whisper Quiet:** Durable metal tumbler with rubber lining minimizes noise during operation - • **Perfect for Aspiring Geologists:** Designed for ages 8+ with adult supervision, making science hands-on and fun ## Overview The NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit is a premium STEM science set designed for geology enthusiasts aged 8 and up. Featuring a durable metal and rubber-lined barrel, it uses a 4-stage silicon carbide polishing grit system to transform rough gemstones into beautifully polished stones. The kit includes rough gems, jewelry fastenings, and a detailed learning guide, making it perfect for hands-on educational fun that sharpens critical thinking and sorting skills. Backed by a 1-year warranty, this kit blends science, creativity, and craftsmanship in one engaging package. ## Description Complete rock polishing kit with 227g rough rocks, 4-stage grit, durable leak-proof tumbler, quiet rubber-lined barrel. Transform rocks into beautiful polished gemstones. ## Features - CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby! This starter rock tumbler turns rough rocks into beautifully polished gemstones with simple operation and a durable design. PLEASE NOTE: This tumbler has a Type G UK plug. - 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 227 grams of rough rocks with 9 different types of gemstones inside, 5 jewellery fastenings, and our 4-stage rock polishing grit. - EASY TO USE AND EDUCATIONAL - Detailed tumbler instructions lead you step-by-step through the rock tumbling process, a full-colour learning guide details how rocks are naturally polished and has fascinating facts about the gemstones in the kit. - HIGH-QUALITY EDUCATIONAL TOYS - National Geographic is proud to make the highest quality hands-on science toys, and all our products are backed by exceptional service. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01I56RV0C | | Age Range Description | 8 years and up | | Art Craft Kit Type | rock tumbling | | Best Sellers Rank | 33,773 in Toys & Games ( See Top 100 in Toys & Games ) 106 in Glassware Tumblers 149 in Model Building Accessories, Hardware & Tools 297 in Educational Science Kits | | Brand Name | Blue Marble | | Colour | Black | | Country Of Origin | China | | Customer Reviews | 4.2 4.2 out of 5 stars (10,854) | | Global Trade Identification Number | 00816448020391 | | Included Components | Rock Tumbler, Leak-proof, Rubber-lined Tumbler Barrel, ½ Pound of Stones, Four Levels of Grit, 5 Jewelry Fastenings | | Item Dimensions | 27.9 x 13.2 x 30.5 centimetres | | Item Highlight | 227 g Rough Rocks, Rock Tumbler Grit, 5 Jewellery Fastenings, Leak-Proof Tumbler, Rock Polishing, Geology Activity | | Item Type Name | Fastenings & Detailed Learning Guide - Great Stem Science Kit For Mineralogy & Geology Enthusiasts | | Item Weight | 1.9 Kilograms | | Manufacturer | JMW Sales, Inc. | | Manufacturer Part Number | NGTUMBLER2 | | Material Type | Plastic | | Model Name | Starter Rock Tumbler Kit - Complete Rock Polisher Kit, | | Model Number | NGTUMBLER2 | | Number of Packs | 1 | | Number of Pieces | 30 | | Product Style | Modern | | Product Warranty | 1 year warranty. | | Seasons | All Seasons | | Set Name | Starter Kit | | Size | 1 Count (Pack of 1) | | Special Features | Leak Proof | | Subject Character | Rock Tumbling & Gemstone Creation | | Target Audience | boys, girls, unisex-children | | Theme | Geology - Rock Polishing | | UPC | 816448020391 | | Unit Count | 1.0 count | ## Product Details - **Age range (description):** 8 years and up - **Brand:** Blue Marble - **Colour:** Black - **Item dimensions L x W x H:** 27.9 x 13.2 x 30.5 centimetres - **Theme:** Geology - Rock Polishing ## Images ![National Geographic Starter Rock Tumbler Kit with Grit and Rocks - Image 1](https://m.media-amazon.com/images/I/81PhaCLjWXL.jpg) ## Questions & Answers **Q: Is there any chance of the tumbler causing a fire if left on? For example if i went out would the tumbler be safe to leave on?** A: tumbler has been left on for the day when i've gone to wrok, multiple times. Never caused me an issue. Motor shouldn't generate enough heat friction to start a fire, and electrics shouldn't cause an issue because the fuse would tirp out the electrics **Q: How loud is it? Compare to something?** A: The volume of noise will depend on many variable, but the decibel range will be 80-88. You can find many decibel charts online. But for comparison this is in the range of a hair drier and truck level. **Q: can it Polish sea glass** A: Absolutely. We have tested various pieces of glass and it cone out looking really good. **Q: What is the wattage** A: Our Pro tumbler has a watts power output of 13 watts at max efficiency, the starter would be under this max. ## Frequently Bought Together - 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 - 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 - 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 --- ## 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.jp/products/47945287-national-geographic-starter-rock-tumbler-kit-with-grit-and-rocks](https://www.desertcart.jp/products/47945287-national-geographic-starter-rock-tumbler-kit-with-grit-and-rocks) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-20*