---
product_id: 222772348
title: "National Geographic Hobby Rock Tumbler Kit – Durable Leak-Proof Rock Polisher with 7-Day Timer, Complete Rock Tumbling Kit with Grit, Jewelry Settings & GemFoam Polish, Educational STEM Science Kit"
brand: "blue marble"
price: "133652CFA"
currency: XOF
in_stock: true
url: https://www.desertcart.sn/products/222772348-national-geographic-hobby-rock-tumbler-kit-durable-leak-proof-rock
store_origin: SN
region: Senegal
---

# GemFoam polish for dazzling shine Leak-proof stainless steel lid 7-day timer for set & forget National Geographic Hobby Rock Tumbler Kit – Durable Leak-Proof Rock Polisher with 7-Day Timer, Complete Rock Tumbling Kit with Grit, Jewelry Settings & GemFoam Polish, Educational STEM Science Kit

**Brand:** blue marble
**Price:** 133652CFA
**Availability:** ✅ In Stock

## Summary

> 💎 Turn your curiosity into sparkling reality!

## Quick Answers

- **What is this?** National Geographic Hobby Rock Tumbler Kit – Durable Leak-Proof Rock Polisher with 7-Day Timer, Complete Rock Tumbling Kit with Grit, Jewelry Settings & GemFoam Polish, Educational STEM Science Kit by blue marble
- **How much does it cost?** 133652CFA 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-durable-leak-proof-rock)

## 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

- • **All-Inclusive Kit:** Includes 9 gemstone varieties, grit, jewelry settings, and strainer for a complete experience.
- • **Durable & Reliable:** Robust motor with adjustable time and speed controls built to last.
- • **Award-Winning STEM Fun:** Toy of the Year winner that inspires creativity, education, and hands-on learning.
- • **Effortless Gem Creation:** Transform rough stones into polished gems with ease and precision.
- • **Revolutionary GemFoam Polish:** Reusable foam technology delivers a brilliant, museum-quality shine every time.

## Overview

The National Geographic Hobby Rock Tumbler Kit is a durable, leak-proof rock polisher featuring a 7-day timer and adjustable speed settings. This all-in-one STEM kit includes 1/2 pound of rough rocks with nine gemstone types, tumbler grit, jewelry fastenings, a strainer, and innovative GemFoam polish for a brilliant finish. Designed for both kids and adults, it combines educational value with award-winning quality and ease of use.

## Description

National Geographic Hobby Rock Tumbler Kit – Durable Leak-Proof Rock Polisher with 7-Day Timer, Complete Rock Tumbling Kit with Grit, Jewelry Settings & GemFoam Polish, Educational STEM Science Kit

## 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!
- 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 |
|---------------|-------|
| Theme | Geology |
| Item Dimensions | 13.11 x 5 x 8.15 inches |
| Item Weight | 4.4 Pounds |

## 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 – Durable Leak-Proof Rock Polisher with 7-Day Timer, Complete Rock Tumbling Kit with Grit, Jewelry Settings & GemFoam Polish, Educational STEM Science Kit - 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 Senegal*
*Store origin: SN*
*Last updated: 2026-01-23*