--- product_id: 47945287 title: "NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit - Includes Rough Gemstones, 4-Stage Silicon Carbide Polishing Grit, Jewellery Fastenings & Learning Guide - STEM Science Kit for Geology Enthusiasts" brand: "blue marble" price: "€ 127.93" currency: EUR in_stock: true reviews_count: 13 category: "Blue Marble" url: https://www.desertcart.hr/products/47945287-national-geographic-starter-rock-tumbler-kit-includes-rough-gemstones-4 store_origin: HR region: Croatia --- # 227g rough gemstones included quiet, rubber-lined leak-proof barrel 4-stage silicon carbide polishing grit NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit - Includes Rough Gemstones, 4-Stage Silicon Carbide Polishing Grit, Jewellery Fastenings & Learning Guide - STEM Science Kit for Geology Enthusiasts **Brand:** blue marble **Price:** € 127.93 **Availability:** βœ… In Stock ## Summary > πŸ’Ž Polish your passion, rock your style! ## Quick Answers - **What is this?** NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit - Includes Rough Gemstones, 4-Stage Silicon Carbide Polishing Grit, Jewellery Fastenings & Learning Guide - STEM Science Kit for Geology Enthusiasts by blue marble - **How much does it cost?** € 127.93 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/47945287-national-geographic-starter-rock-tumbler-kit-includes-rough-gemstones-4) ## 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€’ **Create Personalized Jewelry:** Craft unique necklaces, rings, and keychains with your polished stones. - β€’ **Complete All-in-One STEM Kit:** Includes gemstones, polishing grit, jewelry fastenings & a detailed learning guide. - β€’ **Durable & Whisper-Quiet Operation:** Rubber-lined barrel and robust motor ensure long-lasting, low-noise tumbling. - β€’ **Educational & Engaging Experience:** Step-by-step instructions foster critical thinking and geology passion. - β€’ **Transform Rough Rocks into Stunning Gems:** Turn raw stones into polished treasures with ease and precision. ## Overview The NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit offers 227g of rough gemstones and a 4-stage silicon carbide grit system to transform raw stones into polished gems. Featuring a durable, quiet, rubber-lined barrel and a powerful motor, this all-in-one STEM kit includes jewelry fastenings and a full-color learning guide, making it perfect for geology enthusiasts aged 8 and up who want a hands-on educational experience with lasting creative results. ## 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. Review: A rock tumbeler that works - Ths was a replacement gift for a cheap rock tumbler, far better quality and eaiser to use, it works and is easy to use. It is also far quieter than the cheaper tumbler. It turned out to be an excellent and well received gift, well worth paying more and getting a product that works. Review: Gerat set, one of the best gifts I have ever bought... - One of the best gifts I have ever bought for my daughter... She is 8 and very much into all kinds of rocks and crystals, she has quite a big collection of ready polished stones but now she enjoys tumbling them herself. She has even added some other stones and sea glass to the tumbler. The tumbler comes with a good amount of raw rocks in the set but it does not really say how many of them to put inside the barrel in one go. We have added half of the rocks but then realized there is only one sachet of each type of the grit. Therefore once we're finished with each of the grits we have strained them through coffee filter papers and dried them out on the heater to save them for the second batch of the stones. It would be really useful if the set was coming with more grit or at least for it to be available separately to top-up. There are National Geographic tumbler refill packs that come with the grit but there are only two types of refills (gemstones or jaspers mix), and once you have all of the stones you want just grit alone, not the same rocks. Keep in mind that the tumbling may take weeks, it took us 3 full days for the first grit to lose all the rough edges, 3-4 days for grit #2 and then 5 days for grit #3 and lastly another 5-6 days for the last fine grit. It all depends on the effect you want to achieve and the type of rocks, harder stones like the hematite take longer than rose quartz for instance. Nevertheless, this is a great set, comes with everything needed to start tumbling the stones, there are even strainer and some jewelry findings included in the set to make use of the stones. Recommended. ## 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 | | Best Sellers Rank | 34,464 in Toys & Games ( See Top 100 in Toys & Games ) 234 in Glassware Tumblers 308 in Model Building Accessories, Hardware & Tools 408 in Educational Science Kits | | Brand Name | Blue Marble | | Country Of Origin | China | | Customer Reviews | 4.2 4.2 out of 5 stars (10,752) | | Educational Objective | Critical Thinking, Sorting Skill | | Global Trade Identification Number | 00816448020391 | | Included Components | rock tumbler, grit, gemstones, jewelry fastenings, sifter, learning guide | | Is Assembly Required | No | | Item Dimensions | 27.9 x 13.2 x 30.5 centimetres | | 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 | | Manufacturer Warranty Description | 1 Year Warranty | | Material Type | Metal, Rubber Lined Barrel | | Maximum Age Recommendation | 1188.0 | | Minimum Age Recommendation | 96.00 | | Model Number | NGTUMBLER2 | | Set Name | Necklace, Key chain, Ring, Two clip-on earring fastenings | | Size | 1 Count (Pack of 1) | | Sub Brand | National Geographic | | Theme | Geology - Rock Polishing | | UPC | 816448020391 | | Unit Count | 1.0 count | ## Product Details - **Age range (description):** 8 years and up - **Brand:** Blue Marble - **Item dimensions L x W x H:** 27.9 x 13.2 x 30.5 centimetres - **Size:** 1 Count (Pack of 1) - **Theme:** Geology - Rock Polishing ## Images ![NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit - Includes Rough Gemstones, 4-Stage Silicon Carbide Polishing Grit, Jewellery Fastenings & Learning Guide - STEM Science Kit for Geology Enthusiasts - 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ A rock tumbeler that works *by R***L on 28 January 2025* Ths was a replacement gift for a cheap rock tumbler, far better quality and eaiser to use, it works and is easy to use. It is also far quieter than the cheaper tumbler. It turned out to be an excellent and well received gift, well worth paying more and getting a product that works. ### ⭐⭐⭐⭐⭐ Gerat set, one of the best gifts I have ever bought... *by M***M on 4 January 2019* One of the best gifts I have ever bought for my daughter... She is 8 and very much into all kinds of rocks and crystals, she has quite a big collection of ready polished stones but now she enjoys tumbling them herself. She has even added some other stones and sea glass to the tumbler. The tumbler comes with a good amount of raw rocks in the set but it does not really say how many of them to put inside the barrel in one go. We have added half of the rocks but then realized there is only one sachet of each type of the grit. Therefore once we're finished with each of the grits we have strained them through coffee filter papers and dried them out on the heater to save them for the second batch of the stones. It would be really useful if the set was coming with more grit or at least for it to be available separately to top-up. There are National Geographic tumbler refill packs that come with the grit but there are only two types of refills (gemstones or jaspers mix), and once you have all of the stones you want just grit alone, not the same rocks. Keep in mind that the tumbling may take weeks, it took us 3 full days for the first grit to lose all the rough edges, 3-4 days for grit #2 and then 5 days for grit #3 and lastly another 5-6 days for the last fine grit. It all depends on the effect you want to achieve and the type of rocks, harder stones like the hematite take longer than rose quartz for instance. Nevertheless, this is a great set, comes with everything needed to start tumbling the stones, there are even strainer and some jewelry findings included in the set to make use of the stones. Recommended. ### ⭐⭐⭐⭐ Effective, but noisy. *by M***4 on 2 January 2019* Hard to open, but a good device. Sounds like rain on a roof window (only louder), so you might want to leave it in the garage, or turn it off when you’re home. Supplied with everything you need to get started other than electricity and tap water. Supplied with a power cable and transformer for insertion into the UK mains supply. ## 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? - 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/47945287-national-geographic-starter-rock-tumbler-kit-includes-rough-gemstones-4](https://www.desertcart.hr/products/47945287-national-geographic-starter-rock-tumbler-kit-includes-rough-gemstones-4) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-06*