--- product_id: 381792985 title: "National Geographic Rock Tumbler Kit - 1.36 kg Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Includes Rocks for Tumbling & Rock Polisher Grit, Stone Polisher for Adults & Kids" brand: "blue marble" price: "1549.18 DT" currency: TND in_stock: true reviews_count: 13 category: "Blue Marble" url: https://www.desertcart.tn/products/381792985-national-geographic-rock-tumbler-kit-1-36-kg-extra-large store_origin: TN region: Tunisia --- # 1.36 kg extra-large barrel 9-day programmable timer 3-speed motor precision National Geographic Rock Tumbler Kit - 1.36 kg Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Includes Rocks for Tumbling & Rock Polisher Grit, Stone Polisher for Adults & Kids **Brand:** blue marble **Price:** 1549.18 DT **Availability:** ✅ In Stock ## Summary > 💎 Turn your curiosity into brilliance—polish your own gems and join the rockstar hobbyists! ## Quick Answers - **What is this?** National Geographic Rock Tumbler Kit - 1.36 kg Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Includes Rocks for Tumbling & Rock Polisher Grit, Stone Polisher for Adults & Kids by blue marble - **How much does it cost?** 1549.18 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/381792985-national-geographic-rock-tumbler-kit-1-36-kg-extra-large) ## 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 - • **Durable & Quiet Design:** Stainless steel, leak-proof barrel with 75% noise reduction keeps your space peaceful. - • **Effortless Gemstone Creation:** Transform rough stones into dazzling gems with professional-grade tumbling technology. - • **Customizable Tumbling Control:** Set your pace with a 3-speed motor and 9-day timer for hands-free, precise polishing. - • **STEM-Approved Fun for All Ages:** Boost critical thinking and hand-eye coordination with a hobby that’s as educational as it is addictive. - • **All-Inclusive Rock Polishing Kit:** Includes 1.36 kg of diverse rough rocks, polishing grit, GemFoam, and jewelry fastenings—everything you need to shine. ## Overview The National Geographic Rock Tumbler Kit features a robust 1.36 kg stainless steel barrel powered by a 3-speed motor and a 9-day timer, enabling hands-off, customizable rock polishing. Designed for both adults and kids, this all-in-one STEM kit includes rough rocks, polishing grit, the innovative reusable GemFoam polisher, and jewelry fastenings, making it a durable, quiet, and educational tool for creating stunning gemstones at home. ## Description Turn rough rocks into polished gemstones with this professional-grade rock tumbler featuring a 1.36kg barrel, 3-speed motor, and 9-day timer for easy, hands-off tumbling. Review: Excellent customer service - Bought this tumbler as a Christmas present. Recipient was at first delighted but the tumbler has now stopped working. On closer inspection it appears that the brushes are worn out. So I looked to buy some replacement brushes but apparently neither National Geographic nor Blue Marble supply them!! So this will be an expensive purchase. *Update* Have managed to contact Blue Marble and they have promised to send replacement. Watch this space but am happy with their response. Complete new rock tumbler set arrived today, expected by next Wednesday. Very happy husband, excellent customer service. Review: Fun for people who enjoy cute hobbies - For a drum that goes round and round, it’s expensive. It’s a very well built machine, reassuring quality and heft, and seals the liquid in very well. It’s not quiet. I’ve never had or seen one of these before, so it may be quiet in comparison to others, but it is not quiet. Have it in a cupboard in the kitchen and can hear it throughout all the downstairs. It’s not an annoying noise however, similar sound to a humming fridge so it does fade into the background very easily. Can’t really comment on the performance, it just rotates rocks, but it’s smooth and consistent. Came with an extra drive belt too which is a genuinely fantastic bit of thought. Highly recommend, based on my very limited experience. ## Features - Warning:Toy inside. Adult supervision recommended - CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This professional rock tumbler 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 - The durable motor has time and speed control settings so you can set it, and forget it. An improved, leak-proof barrel features a stainless-steel lid is 75% quieter overall than plastic tumbler barrels. - ALL-IN-ONE TUMBLING KIT - This kit has everything you need and then some! You get 1.36 kg of rough rocks with nine different types of gemstones inside, five jewellery fastenings, grit, a strainer, and our innovative new GemFoam rock polisher. - USE GEMFOAM FOR DAZZLING RESULTS - This rock tumbler kit stands apart from others thanks to our new, reusable GemFoam rock polisher! Add GemFoam and water to the barrel after your final tumbling stage and your gems will have incredible shine! - SATISFACTION GUARANTEED – The National Geographic STEM series provides kids high-quality educational toys that are a whole lot of fun! If your experience is anything less than extraordinary, let us know so we can make it right for you. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08DL95CWL | | Age Range Description | 8 years and up | | Age range (description) | 8 years and up | | Best Sellers Rank | 28,445 in Toys & Games ( See Top 100 in Toys & Games ) 348 in Educational Science Kits | | Brand | Blue Marble | | Brand Name | Blue Marble | | Country Of Origin | China | | Customer Reviews | 4.5 out of 5 stars 4,800 Reviews | | Educational Objective | STEM, Concept Development Skills, Hand-Eye Coordination, Critical Thinking, Reasoning Exploratory Skills | | Included Components | Polisher | | Is Assembly Required | No | | Item Dimensions | 32.4 x 26.2 x 17 centimetres | | Item Weight | 3.7 Kilograms | | Item dimensions L x W x H | 32.4 x 26.2 x 17 centimetres | | Item weight | 3.7 Kilograms | | Manufacturer | Blue Marble | | Manufacturer Part Number | NGTUMBLER3LB | | Manufacturer recommended age | 0 - 2 years | | Material Type | Stainless Steel | | Model Number | NGTUMBLER3LB | | Number of Items | 1 | | Number of Packs | 1 | | Set Name | National Geographic Rock Tumbler Kit | | Size | Large | | Sub Brand | National Geographic | | Theme | Earth Science | | UPC | 816448028694 | | Unit Count | 1.0 count | ## Product Details - **Age range (description):** 8 years and up - **Brand:** Blue Marble - **Item dimensions L x W x H:** 32.4 x 26.2 x 17 centimetres - **Size:** Large - **Theme:** Earth Science ## Images ![National Geographic Rock Tumbler Kit - 1.36 kg Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Includes Rocks for Tumbling & Rock Polisher Grit, Stone Polisher for Adults & Kids - Image 1](https://m.media-amazon.com/images/I/91Vx2nUurJL.jpg) ## Questions & Answers **Q: How much power does this tumbler use per hour? Ive looked through the information but cant find the Kw anywhere listed** A: I can speak for the UK but in the US the cost to run one of our tumblers for say a 24-hour period would cost less than $.36-90 cents a week max depending on their per kWh rates. These take .3 Amps, so (watts = amps x volts) OR watts = .3 x 110 which equals 33 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: Is this mains powered as it says batteries required in comparison with others** A: Yes it’s powered from the mains. My son is delighted with ours. **Q: Will it work with 220v eu electricity?** A: Yes we use it in the UK with a 220v 50Hz power supply which is universal in Europe. **Q: what are the dimensions of just the barrel please** A: Our National Geographic 3 pound barrel is 6 1/2" X 3 3/4" ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent customer service *by M***J on 29 July 2026* Bought this tumbler as a Christmas present. Recipient was at first delighted but the tumbler has now stopped working. On closer inspection it appears that the brushes are worn out. So I looked to buy some replacement brushes but apparently neither National Geographic nor Blue Marble supply them!! So this will be an expensive purchase. *Update* Have managed to contact Blue Marble and they have promised to send replacement. Watch this space but am happy with their response. Complete new rock tumbler set arrived today, expected by next Wednesday. Very happy husband, excellent customer service. ### ⭐⭐⭐⭐⭐ Fun for people who enjoy cute hobbies *by D***N on 7 November 2023* For a drum that goes round and round, it’s expensive. It’s a very well built machine, reassuring quality and heft, and seals the liquid in very well. It’s not quiet. I’ve never had or seen one of these before, so it may be quiet in comparison to others, but it is not quiet. Have it in a cupboard in the kitchen and can hear it throughout all the downstairs. It’s not an annoying noise however, similar sound to a humming fridge so it does fade into the background very easily. Can’t really comment on the performance, it just rotates rocks, but it’s smooth and consistent. Came with an extra drive belt too which is a genuinely fantastic bit of thought. Highly recommend, based on my very limited experience. ### ⭐⭐⭐⭐⭐ Rock and Roll *by C***M on 24 March 2024* An honest review, the tumbler is fantastic, I watched some Youtube videos comparing it to others and have found that it has low energy use and can tumble much faster than most other tumblers. It's in my kitchen and with the door closed I cannot hear it when I'm watching TV or listening to music (Although I quite like the sound of the tumbler, it's relaxing to me so I leave my door open). I am a total amateur and my only experience is picking up pretty stones in my travels. I've accumulated a few nice ones! But this kit also came with some very nice stones too! (Although many too small to survive the process). The instructions said that the first grit should be run for 3 days on the top speed, but after around 24 hours I checked my first batch and most were ready, my second and third batch ran again for another 24 hours each and I ended up with 1 large batch of well rounded stones, however many of the stones shrank significantly and I think a couple totally disintegrated so be careful! Check often, rinse them off (Not down the sink) and take them out when ready, put the not-ready ones back in. Unlike the suggestion to tumble them with the first grit for 3 days on max speed... I'd have lost most of my stones if I had blindly followed that instruction. Be ready to have to deal with sludge, the water gets very dirty and does not want to be poured down the sink, I put it in a bucket and leave it for 24 hours to settle than syphon off the clean water and leave the dirty sludge to dehydrate into a solid. I hope that helps, I'm really enjoying this new hobby! But I've already run out of stones, oh no! ## Frequently Bought Together - 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 - 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? - 🛒 **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.tn/products/381792985-national-geographic-rock-tumbler-kit-1-36-kg-extra-large](https://www.desertcart.tn/products/381792985-national-geographic-rock-tumbler-kit-1-36-kg-extra-large) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-29*