--- product_id: 47945287 title: "NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit with Grit and Rocks" brand: "blue marble" price: "€ 131.19" currency: EUR in_stock: true reviews_count: 13 category: "Blue Marble" url: https://www.desertcart.hr/products/47945287-national-geographic-starter-rock-tumbler-kit-with-grit-and-rocks store_origin: HR region: Croatia --- # 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:** € 131.19 **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?** € 131.19 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-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. Review: Well received gift, looks well made. - My order arrived on time and well packaged. This was a birthday present for my 9 year old daughter who has been fascinated with 'shiny' stones since she was tiny. On her birthday we opened the box, read the instructions, and proceeded to get up and running. The product is well made, it is very simple, looks to be pretty robust, no complaints. My only slight criticism is that there are not many rough stones supplied with the kit. The instructions say the tumbler works best half to two thirds full and the supplied material barely met the minimum criteria. I purchased a top up kit at the same time as this on the basis it is described as a starter kit. We were up and running in just a few minutes. As expected, once running the tumbler is quite noisy but that is the stones rattling together, not the actual tumbler whose motor is silent. After 5 minutes my daughter was keen to 'see the results' so I had to reiterate that the whole process would take several days. The tumbler will now be consigned to the garage, to tumble away to itself, with reminders set to check progress periodically. I am sure this is going to bring a lot of long term fun and pleasure to my daughter and no doubt will result in even more pockets of stones being collected on country walks in the future. 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 - Warning:Not suitable for children under 3 years. For use under adult supervision - Warning:Toy inside. Adult supervision recommended - 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 | | Age range (description) | 8 years and up | | Art Craft Kit Type | rock tumbling | | Best Sellers Rank | 22,752 in Toys & Games ( See Top 100 in Toys & Games ) 100 in Glassware Tumblers 124 in Model Building Accessories, Hardware & Tools 265 in Educational Science Kits | | Brand | Blue Marble | | Brand Name | Blue Marble | | Colour | Black | | Country Of Origin | China | | Customer Reviews | 4.2 out of 5 stars 10,844 Reviews | | 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 | | Item dimensions L x W x H | 27.9 x 13.2 x 30.5 centimetres | | Manufacturer | JMW Sales, Inc. | | Manufacturer Part Number | NGTUMBLER2 | | Material | Plastic | | 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 | | 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 with Grit and Rocks - Image 1](https://m.media-amazon.com/images/I/81PhaCLjWXL.jpg) ![NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit with Grit and Rocks - Image 2](https://m.media-amazon.com/images/I/81HBStJnnQL.jpg) ![NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit with Grit and Rocks - Image 3](https://m.media-amazon.com/images/I/81PhuC7g+yL.jpg) ![NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit with Grit and Rocks - Image 4](https://m.media-amazon.com/images/I/81F9miLxRuL.jpg) ![NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit with Grit and Rocks - Image 5](https://m.media-amazon.com/images/I/810gF5hrp5L.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 ### ⭐⭐⭐⭐⭐ Well received gift, looks well made. *by E***S on 6 June 2017* My order arrived on time and well packaged. This was a birthday present for my 9 year old daughter who has been fascinated with 'shiny' stones since she was tiny. On her birthday we opened the box, read the instructions, and proceeded to get up and running. The product is well made, it is very simple, looks to be pretty robust, no complaints. My only slight criticism is that there are not many rough stones supplied with the kit. The instructions say the tumbler works best half to two thirds full and the supplied material barely met the minimum criteria. I purchased a top up kit at the same time as this on the basis it is described as a starter kit. We were up and running in just a few minutes. As expected, once running the tumbler is quite noisy but that is the stones rattling together, not the actual tumbler whose motor is silent. After 5 minutes my daughter was keen to 'see the results' so I had to reiterate that the whole process would take several days. The tumbler will now be consigned to the garage, to tumble away to itself, with reminders set to check progress periodically. I am sure this is going to bring a lot of long term fun and pleasure to my daughter and no doubt will result in even more pockets of stones being collected on country walks in the future. ### ⭐⭐⭐⭐⭐ 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. ### ⭐⭐⭐⭐ Value for money, Hardy werher a beginner or not its real simple x *by E***A on 23 September 2026* Great little tumbler, only has one speed, seems very resilient. Hardy, and compact can be a bit loud. Value for money definitely all in all its worth the money x ## 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.hr/products/47945287-national-geographic-starter-rock-tumbler-kit-with-grit-and-rocks](https://www.desertcart.hr/products/47945287-national-geographic-starter-rock-tumbler-kit-with-grit-and-rocks) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-10-01*