---
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: "฿18199"
currency: THB
in_stock: true
reviews_count: 13
category: "Blue Marble"
url: https://www.desertcart.co.th/products/381792985-national-geographic-rock-tumbler-kit-1-36-kg-extra-large
store_origin: TH
region: Thailand
---

# 9-day programmable timer 3-speed motor precision 1.36 kg extra-large barrel 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:** ฿18199
**Availability:** ✅ In Stock

## Summary

> 💎 Turn rough stones into polished treasures—because your desk deserves a little sparkle!

## 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?** ฿18199 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/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

- • **Quiet Powerhouse:** 75% quieter stainless steel barrel with leak-proof design keeps your space peaceful and clean.
- • **STEM-Approved Fun:** Boosts critical thinking and hand-eye coordination—perfect for professionals nurturing creativity or gifting curious kids.
- • **Effortless Gemstone Mastery:** Set it, forget it—3-speed motor with a 9-day timer for hands-free, flawless polishing.
- • **All-Inclusive Creativity Kit:** Comes with 1.36 kg of rough rocks, polishing grit, GemFoam, and jewelry fastenings—everything to start your gem journey.
- • **Next-Level Shine with GemFoam:** Innovative reusable foam polisher delivers dazzling, museum-quality gemstone brilliance.

## Overview

The National Geographic Rock Tumbler Kit features a durable 1.36 kg stainless steel barrel powered by a 3-speed motor and a 9-day timer for customizable, hands-off tumbling. Designed for both adults and kids, it includes a complete set of rough rocks, polishing grit, and the innovative GemFoam polisher to achieve professional-grade gemstone shine. Its quiet, leak-proof design and STEM-focused educational value make it a standout hobby kit for creative professionals and families alike.

## 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: 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.
Review: Rock and Roll - 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!

## Features

- 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 |
| Assembly Required | No |
| Batteries Required? | Yes |
| Batteries included? | No |
| Best Sellers Rank | 32,921 in Toys & Games ( See Top 100 in Toys & Games ) 419 in Educational Science Kits |
| Colour | Multicolor |
| Customer Reviews | 4.4 4.4 out of 5 stars (4,636) |
| Date First Available | 24 July 2020 |
| Educational Objective(s) | STEM, Concept Development Skills, Hand-Eye Coordination, Critical Thinking, Reasoning Exploratory Skills |
| Item model number | NGTUMBLER3LB |
| Language | English |
| Manufacturer recommended age | 8 years and up |
| Material Type(s) | Stainless Steel |
| Number of Game Players | 1 |
| Product Dimensions | 32.4 x 26.2 x 17 cm; 3.7 kg |
| Remote Control Included? | No |

## 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:** Geology

## 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

### ⭐⭐⭐⭐⭐ 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!

### ⭐⭐⭐⭐⭐ Lovely bit of kit
*by B***E on 23 January 2024*

Bought for my 9 year old Granddaughter. She loves being outdoors looking for rocks etc. This comes as a complete kit including the rocks. Not cheap but it's well made and results are great. She thinks it's "spot on".

## 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

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-01-28*