---
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: "911.41 DT"
currency: TND
in_stock: true
category: "Blue Marble"
url: https://www.desertcart.tn/products/316075421-blue-marble-national-geographic-hobby-rock-tumbler-kit-complete-durable
store_origin: TN
region: Tunisia
---

# GemFoam polish for dazzling shine Time & speed control motor 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:** 911.41 DT
**Availability:** ✅ In Stock

## Summary

> 💎 Turn rough stones into polished gems—and your downtime into a dazzling creative escape!

## 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?** 911.41 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/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:** Leak-proof barrel with stainless steel lid ensures mess-free, long-lasting tumbling sessions.
- • **Next-level shine:** Innovative reusable GemFoam polishing foam delivers a professional-grade sparkle that stands out.
- • **Set it & forget it:** Durable motor with customizable time and speed controls lets you multitask while your gems get perfected.
- • **STEM meets creativity:** Educational kit designed to inspire geology knowledge and hands-on artistic expression for ages 8+.
- • **All-in-one treasure trove:** Includes 1 lb of rough rocks with 9 gemstone varieties, polishing grit, strainer, and jewelry fastenings—everything you need to start creating.

## Overview

The Blue Marble National Geographic Hobby Rock Tumbler Kit is a robust, all-inclusive rock tumbling system featuring a durable motor with adjustable time and speed, a leak-proof stainless steel barrel, and a patented GemFoam polishing foam for superior shine. Perfect for beginners and hobbyists aged 8 and up, it includes one pound of rough rocks with nine gemstone types, tumbling grit, jewelry fastenings, and educational materials, making it a fun STEM activity that transforms raw stones into beautiful, polished gems.

## 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.

## 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 |
| Age Range Description | 8 years and up |
| Battery Description | Not required (mains powered) |
| Best Sellers Rank | #28,200 in Kitchen ( See Top 100 in Kitchen ) #363 in Tumblers & Water Glasses |
| Brand Name | Blue Marble |
| Customer Reviews | 4.3 4.3 out of 5 stars (3,631) |
| Educational Objective | Geology and Creative Thinking |
| Included Components | 1/2lb rough rocks, 4 Stage Grit, Original GemFoam Polishing Media, toys |
| Is Assembly Required | No |
| Item Dimensions | 33.3 x 12.7 x 20.7 centimeters |
| Item Type Name | toys |
| Item Weight | 1.9 Kilograms |
| Language | English |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer Maximum Age (MONTHS) | 120 |
| Manufacturer Minimum Age (MONTHS) | 12.0 |
| Manufacturer Part Number | NGHOBBYTUMBLER2 |
| Manufacturer Warranty Description | No Warranty |
| Material Type | Cotton |
| Model Number | NGHOBBYTUMBLER2 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Set Name | Hobby Rock Tumbler Kit |
| Size | One Size |
| Sub Brand | National Geographic |
| Theme | Geology |
| UPC | 816448028830 |
| Unit Count | 1 Count |

## 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.

## 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 Tunisia*
*Store origin: TN*
*Last updated: 2026-09-10*