---
product_id: 316075421
title: "Blue Marble National Geographic Hobby Rock Tumbler Kit - Complete With Durable Tumbler, Rocks, Grit, And Patented Gemfoam Finishing Foam Polish, Educational Stem Science"
brand: "blue marble"
price: "37859 som"
currency: KGS
in_stock: true
reviews_count: 5
category: "Blue Marble"
url: https://www.desertcart.kg/products/316075421-blue-marble-national-geographic-hobby-rock-tumbler-kit-complete-durable
store_origin: KG
region: Kyrgyzstan
---

# GemFoam polish for brilliant shine Adjustable time & speed control Leak-proof stainless steel barrel Blue Marble National Geographic Hobby Rock Tumbler Kit - Complete With Durable Tumbler, Rocks, Grit, And Patented Gemfoam Finishing Foam Polish, Educational Stem Science

**Brand:** blue marble
**Price:** 37859 som
**Availability:** ✅ In Stock

## Summary

> 💎 Turn rough stones into polished gems—and your creativity into a conversation starter!

## Quick Answers

- **What is this?** Blue Marble National Geographic Hobby Rock Tumbler Kit - Complete With Durable Tumbler, Rocks, Grit, And Patented Gemfoam Finishing Foam Polish, Educational Stem Science by blue marble
- **How much does it cost?** 37859 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/316075421-blue-marble-national-geographic-hobby-rock-tumbler-kit-complete-durable)

## 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

- • **Built to Endure:** Durable motor and leak-proof barrel with stainless steel lid ensure long-lasting, mess-free tumbling.
- • **Next-Level Shine:** Innovative reusable GemFoam polishing foam delivers dazzling, museum-quality gemstone brilliance.
- • **STEM Meets Style:** Educational and creative, this kit sharpens geology knowledge while crafting wearable art—perfect for the curious professional.
- • **Set It & Forget It:** Customizable timer and speed let you multitask while your gems get perfected.
- • **All-Inclusive Gem Lab:** Includes 1 lb of rough rocks with 9 gemstone varieties, polishing grit, jewelry fastenings, and strainer—everything you need to start creating.

## Overview

The Blue Marble NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit is a durable, all-in-one STEM science kit designed for both kids and adults to transform rough rocks into polished gemstones. Featuring adjustable time and speed controls, a leak-proof stainless steel barrel, and the patented GemFoam polishing foam, this kit offers a complete, mess-free tumbling experience. It includes one pound of rough rocks with nine gemstone types, polishing grit, jewelry fastenings, and a strainer, making it perfect for educational and creative exploration.

## Description

CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This robust 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. | ALL-IN-ONE TUMBLING KIT - You get one pound of rough rocks with nine different types of gemstones inside, five jewelry fastenings, tumbler grit, a strainer, and our innovative new GemFoam polishing foam. | 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.

Review: cadeau de noel pour mes parents qui aime faire des bijoux fantaisies. il me dise que le procédé est long mais que le résultat est bon. les pierres qu'ils ont ramassé eux même on perdu 50% de leur taille.
Review: It is incredibly loud. There is no place in my house that I can run this overnight. I live in Canada, cannot leave water in unheated shed. There is enough abrasive material for one tumbling cycle. The cycles take 3 - 6 days each. Many of the included rocks are so small, they are unusable after the 2nd or 3rd cycle. This product could be better. It does exactly as intended. My son is more knowledgable since we purchased this product.

## Features

- CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This robust rock tumbler makes it fun and easy to turn rough
- 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.
- ALL-IN-ONE TUMBLING KIT - You get one pound of rough rocks with nine different types of gemstones inside, five jewelry fastenings, tumbler grit, a strainer, and our innovative new GemFoam polishing foam.
- 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!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B086Z6ZB7R |
| Assembly Required | No |
| Batteries Included? | No |
| Batteries Required? | Yes |
| Best Sellers Rank | #36,107 in Kitchen ( See Top 100 in Kitchen ) #456 in Tumblers & Water Glasses |
| Color | multi |
| Customer Reviews | 4.3 4.3 out of 5 stars (3,521) |
| Date First Available | 28 August 2020 |
| Educational Objective(s) | Geology and Creative Thinking |
| Item model number | NGHOBBYTUMBLER2 |
| Language | English |
| Manufacturer recommended age | 12 months - 3 years |
| Material Type(s) | Cotton |
| Number of Game Players | 1 |
| Product Dimensions | 33.3 x 12.7 x 20.7 cm; 1.9 kg |
| Remote Control Included? | No |
| tech_spec_battery_description_toys | Not required (mains powered) |

## Product Details

- **Age range (description):** 8 years and up
- **Brand:** Blue Marble
- **Item dimensions L x W x H:** 33.3 x 12.7 x 20.7 centimeters
- **Size:** One Size
- **Theme:** Geology

## Images

![Blue Marble National Geographic Hobby Rock Tumbler Kit - Complete With Durable Tumbler, Rocks, Grit, And Patented Gemfoam Finishing Foam Polish, Educational Stem Science - Image 1](https://m.media-amazon.com/images/I/915PyUpEsJL.jpg)

## Questions & Answers

**Q: What is the power consumption of this unit over a week of continuous use? (in usa on 110v). thank you.**
A: This takes .3 Amps, so (watts = amps x volts) OR watts = .3 x 110 which equals33 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: What the difference between this and the starter kit?**
A: There are two main differences:The Hobby Rock Tumbler has a rubber tumbling barrel with a stainless steel cap, which reduces noise and is more durable. The Starter Kit Rock Tumbler has a plastic barrel. The Hobby Rock Tumbler also has a keypad for setting the number of days you would like it to tumble, where as the Starter Kit Rock Tumbler's setting options are on/off. Thank you for your inquiry.

**Q: What pound tumbler is this product?**
A: Dearest National Geographic.... why would you only send 1# of rocks with a two pound tumbler?

**Q: Can i buy extra grit without the rocks. we have many rocks from "mining" gemstones that i would love to polish. what do you recommend?**
A: I recommend you follow the rock tumbler hobbiest MIchigan Rocks on Youtube. He's a good wealth of information for anyone getting into rock tumblers. He and other's mention that the polish from National Geographic is not good. I would go with rock tumbler polish offered by Polly Plastics.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by C***L on 28 March 2023*

cadeau de noel pour mes parents qui aime faire des bijoux fantaisies. il me dise que le procédé est long mais que le résultat est bon. les pierres qu'ils ont ramassé eux même on perdu 50% de leur taille.

### ⭐⭐⭐⭐⭐ Review
*by M***N on 26 November 2023*

It is incredibly loud. There is no place in my house that I can run this overnight. I live in Canada, cannot leave water in unheated shed. There is enough abrasive material for one tumbling cycle. The cycles take 3 - 6 days each. Many of the included rocks are so small, they are unusable after the 2nd or 3rd cycle. This product could be better. It does exactly as intended. My son is more knowledgable since we purchased this product.

### ⭐⭐⭐⭐⭐ Review
*by G***H on 2 June 2024*

This is a great introductory rock polisher and does an excellent job. The manual could include more tips on practical rock polishing. The supplied rock mix contains various types of rocks that in some cases should not be polished together as the softer rocks are destroyed by the harder rocks. That being said it is part of the learning experience. Please note the machine is noisy and may need a sound proof box unless you have a shed some distance from your home.

## Frequently Bought Together

- NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit – Durable Leak-Proof Rock Polisher with 7-Day Timer – Complete Rock Tumbling Kit – Geology Hobby for Kids, Educational STEM Science Kit, Rock Collection
- 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 Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-02-14*