---
product_id: 222772348
title: "National Geographic Hobby Rock Tumbler Kit for Kids and Adult Beginners"
brand: "blue marble"
price: "146117CFA"
currency: XOF
in_stock: true
category: "Blue Marble"
url: https://www.desertcart.sn/products/222772348-national-geographic-hobby-rock-tumbler-kit-for-kids-and-adult
store_origin: SN
region: Senegal
---

# 7-day programmable timer GemFoam polish for dazzling shine leak-proof stainless steel barrel National Geographic Hobby Rock Tumbler Kit for Kids and Adult Beginners

**Brand:** blue marble
**Price:** 146117CFA
**Availability:** ✅ In Stock

## Summary

> 💎 Turn rough stones into polished treasures — your personal gem factory awaits!

## Quick Answers

- **What is this?** National Geographic Hobby Rock Tumbler Kit for Kids and Adult Beginners by blue marble
- **How much does it cost?** 146117CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/222772348-national-geographic-hobby-rock-tumbler-kit-for-kids-and-adult)

## 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 for mess-free polishing
- • **Next-Level Shine:** Innovative reusable GemFoam foam delivers professional-grade gemstone brilliance
- • **STEM Meets Style:** Award-winning kit that sparks creativity and geology passion for ages 8+
- • **All-In-One Gem Lab:** Includes 1/2 lb rough rocks, 4-stage grit, GemFoam polish, and jewelry fastenings
- • **Set It & Forget It:** 7-day timer with adjustable speed for effortless tumbling sessions

## Overview

The National Geographic Hobby Rock Tumbler Kit is a durable, beginner-friendly rock polishing system featuring a 7-day timer, leak-proof stainless steel barrel, and an exclusive GemFoam polishing foam. Designed for kids and adults, it includes rough gemstones, multi-stage grit, and jewelry fastenings, making it a complete STEM-focused hobby kit that transforms raw rocks into dazzling gems with ease.

## Description

Buy National Geographic Hobby Rock Tumbler Kit for Kids and Adult Beginners | Leak-Proof Barrel, 7-Day Timer, Rough Gemstones, 4-Stage Grit, GemFoam Polish, Jewelry Settings, Geology Hobby: Rock Tumblers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

## Features

- CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This robust rock polisher 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 1/2 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 tumbling 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!
- desertcart EXCLUSIVE - Blue Marble has developed this product exclusively for desertcart.
- AWARD-WINNING PRODUCTS - Blue Marble, winner of the Toy Association's prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with a U.S. support team to ensure a stellar experience!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B086Z6ZB7R |
| Age Range Description | 8 years and up |
| Best Sellers Rank | #1,695 in Toys & Games ( See Top 100 in Toys & Games ) #220 in Educational Science Kits |
| Brand Name | Blue Marble |
| Customer Reviews | 4.4 out of 5 stars 3,747 Reviews |
| Educational Objective | STEM |
| Included Components | Complete Rock Tumbling Kit |
| Item Dimensions | 13.11 x 5 x 8.15 inches |
| Item Highlight | Leak-Proof Barrel, 7-Day Timer, Rough Gemstones, 4-Stage Grit, GemFoam Polish, Jewelry Settings, Geology Hobby |
| Item Type Name | Hobby Rock Tumbler Kit |
| Item Weight | 1.9 kg |
| Language | English |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer Part Number | NGHOBBYTUMBLER2 |
| Manufacturer recommended age | 8 years and up |
| Material Type | Plastic |
| Model Number | NGHOBBYTUMBLER2 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Set Name | Rock Tumbler Kit |
| Size | One Size |
| Sub Brand | National Geographic |
| Theme | Earth Science |
| UPC | 816448028830 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Blue Marble
- **Age Range (Description):** 8 years and up
- **Color:** Multicolor
- **Theme:** Geology
- **Item dimensions L x W x H:** 13.11 x 5 x 8.15 inches

## Images

![National Geographic Hobby Rock Tumbler Kit for Kids and Adult Beginners - Image 1](https://m.media-amazon.com/images/I/915PyUpEsJL.jpg)

## Available Options

This product comes in different **Style** options.

## 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

---

## 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.sn/products/222772348-national-geographic-hobby-rock-tumbler-kit-for-kids-and-adult](https://www.desertcart.sn/products/222772348-national-geographic-hobby-rock-tumbler-kit-for-kids-and-adult)

---

*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-09-16*