---
product_id: 395354072
title: "NATIONAL GEOGRAPHIC Rock Tumbling Media – GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbling Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies"
brand: "blue marble"
price: "22579 Ft"
currency: HUF
in_stock: true
reviews_count: 5
category: "Blue Marble"
url: https://www.desertcart.hu/products/395354072-national-geographic-rock-tumbling-media-gemfoam-reusable-rock-polisher-foam
store_origin: HU
region: Hungary
---

# 3-day polishing time Up to 6 reuse cycles Easy clean & store mesh bag NATIONAL GEOGRAPHIC Rock Tumbling Media – GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbling Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies

**Brand:** blue marble
**Price:** 22579 Ft
**Availability:** ✅ In Stock

## Summary

> ✨ Elevate your rock game—shine smarter, not harder!

## Quick Answers

- **What is this?** NATIONAL GEOGRAPHIC Rock Tumbling Media – GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbling Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies by blue marble
- **How much does it cost?** 22579 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/395354072-national-geographic-rock-tumbling-media-gemfoam-reusable-rock-polisher-foam)

## 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

- • **Award-Winning Quality:** From the makers of Toy of the Year, backed by expert US support.
- • **Unmatched Shine Boost:** Add GemFoam after final grit for a dazzling polish that turns heads.
- • **Reusable & Eco-Friendly:** Use the same pack up to 6 times—sustain your hobby and your budget.
- • **Universal Compatibility:** Works seamlessly with any durable rock tumbler for flawless results.
- • **Effortless Polish Upgrade:** Simply add GemFoam, water, and rocks post-grit cycle for a pro-level finish.

## Overview

National Geographic GemFoam is a patent-pending reusable rock polishing media designed to add exceptional shine to tumbled rocks. Compatible with any durable tumbler, it enhances final polish results in just 3 days and can be reused up to 6 times. The kit includes 30 grams of GemFoam, a mesh storage bag, and easy instructions, making it a must-have for serious hobbyists seeking professional-grade rock tumbling finishes.

## Description

National Geographic GemFoam rock tumbling media will make your tumbled rocks sparkle like never before! This Kit Includes: 30 grams GemFoam, Mesh Storage Bag, and Easy-to-Follow Instructions. Simply add the patent-pending GemFoam to your tumbler after the final grit polishing cycle is complete and in just a few days, your rocks will have a lustrous polish and shine. GemFoam is a truly unique way to improve your rock tumbling results and it works with any tumbler. GemFoam is also reusable up to 6 times and is easy to use as well as simple to clean and store thanks to the reusable mesh storage bag. For best results, use with National Geographic tumblers and rock tumbling accessories like our ceramic pellet media, bulk rock tumbling grit, and rock refill packs. National Geographic Toys makes the highest quality hands-on science toys, and all products are backed by exceptional service. About the National Geographic Society: With a mission to inspire people to care about the planet, the National Geographic Society is one of the world’s largest nonprofit scientific and educational organizations.

Review: facile a utiliser apres avoir utiliser mon 1200 grit
Review: Great tumbler. Use it frequently with no problems.

## Features

- A BRAND NEW WAY TO MAKE TUMBLED ROCKS SHINE – GemFoam is a unique new rock polishing media that gives unprecedented shine to tumbled rocks. Just add the patent-pending rock polishing media to your tumbler after the final grit cycle for great results!
- A LITTLE GOES A LONG WAY – Add a pack of GemFoam to your rock tumbling arsenal and use for multiple tumbling projects. GemFoam is reusable for up to 6 rock polishing cycles and comes with a convenient reusable bag made of mesh for easy storage.
- WORKS WITH ANY ROCK POLISHER - GemFoam is safe to use with any durable tumbler. For best results, use with our National Geographic line of tumblers and rock tumbling supplies, like our ceramic media, tumbling grit, and rock refill packs.
- EASILY IMPROVE YOUR ROCK TUMBLING RESULTS - When your final rock tumbling grit cycle is complete, add GemFoam, water, and the rocks you'd like polished back to the tumbler and tumble up to 3 days. Rocks will will come out with polish and 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 |
|---------------|-------|
| ASIN | B08B7DJTCR |
| Assembly Required | No |
| Batteries Included | No |
| Batteries Required | No |
| Colour | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (597) |
| Date First Available | 24 July 2020 |
| Educational Objective(s) | STEM |
| Item Dimensions LxWxH | 12 x 3 x 18.5 Centimeters |
| Item Weight | 35 g |
| Item model number | NGFOMBAG |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer recommended age | 8 years and up |
| Material Type(s) | Ceramic |
| Model Number | NGFOMBAG |
| Net Quantity | 1.0 Count |
| Number of Game Players | 1 |
| Product Dimensions | 11.99 x 3 x 18.49 cm; 35 g |
| Remote Control Included? | No |
| tech_spec_battery_description_toys | No batteries required |

## Images

![NATIONAL GEOGRAPHIC Rock Tumbling Media – GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbling Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies - Image 1](https://m.media-amazon.com/images/I/51EAJoYo4uL.jpg)
![NATIONAL GEOGRAPHIC Rock Tumbling Media – GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbling Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies - Image 2](https://m.media-amazon.com/images/I/51KT96wk6uL.jpg)
![NATIONAL GEOGRAPHIC Rock Tumbling Media – GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbling Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies - Image 3](https://m.media-amazon.com/images/I/51VXQaAjk6L.jpg)
![NATIONAL GEOGRAPHIC Rock Tumbling Media – GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbling Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies - Image 4](https://m.media-amazon.com/images/I/51Wuf51tJNL.jpg)
![NATIONAL GEOGRAPHIC Rock Tumbling Media – GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbling Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies - Image 5](https://m.media-amazon.com/images/I/51doTbicZJL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by C***O on 8 December 2021*

facile a utiliser apres avoir utiliser mon 1200 grit

### ⭐⭐⭐⭐⭐ Review
*by S***. on 21 January 2026*

Great tumbler. Use it frequently with no problems.

### ⭐ Review
*by B***N on 20 March 2022*

Producct did not polishrock in tumbleer

## Frequently Bought Together

- Blue Marble National Geographic Rock Tumbling Media – GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbling Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies
- 2 LBS Rock Tumbling Ceramic Filler Medi Rock Tumbling Ceramic Filler Media Non- Abrasive Ceramic Pellets for All Type Tumblers 3/16" X 3/8"
- 3LB Rock Tumbler Grit and Polish Refill Set, 4-Step Professional Polish Rock Tumbler Grit to Unlock Stunning Polished Stones. Ideal for National Geographic, KomeStone, and Other Polishers and Tumblers

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-01-26*