---
product_id: 269264802
title: "Blue Marble NATIONAL GEOGRAPHIC Rock Tumbler Media - GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbler Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies"
brand: "blue marble"
price: "$39.52"
currency: USD
in_stock: true
reviews_count: 5
category: "Blue Marble"
url: https://www.desertcart.us/products/269264802-blue-marble-national-geographic-rock-tumbler-media-gemfoam-reusable-rock
store_origin: US
region: United States of America
---

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

**Brand:** blue marble
**Price:** $39.52
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** Blue Marble NATIONAL GEOGRAPHIC Rock Tumbler Media - GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbler Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies by blue marble
- **How much does it cost?** $39.52 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/269264802-blue-marble-national-geographic-rock-tumbler-media-gemfoam-reusable-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

- • **Simple & Time-Saving:** Add after final grit cycle and tumble for just 3 days to achieve professional-grade shine.
- • **Award-Winning Quality:** From Blue Marble, Toy of the Year winner, backed by expert support and STEM education focus.
- • **Unmatched Shine Boost:** GemFoam delivers a patent-pending polish that makes your rocks gleam like never before.
- • **Effortless Integration:** Works seamlessly with any rock tumbler, especially National Geographic’s premium line.
- • **Long-Lasting & Reusable:** Use GemFoam up to 6 times—maximize your tumbling projects with one pack.

## Overview

Blue Marble’s National Geographic GemFoam is a reusable, patent-pending rock polishing foam that enhances the shine of tumbled rocks after the final grit cycle. Compatible with any durable tumbler and reusable up to 6 polishing cycles, it comes with a convenient mesh storage bag and delivers professional-grade results in just 3 days. Designed for STEM enthusiasts aged 8+, this award-winning product combines educational value with superior performance.

## 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: super pour la finition - facile a utiliser apres avoir utiliser mon 1200 grit
Review: Good purchase - 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 |
| Age Range Description | 8 years and up |
| Brand Name | Blue Marble |
| Color | Black |
| Customer Reviews | 4.4 out of 5 stars 596 Reviews |
| Educational Objective | STEM Skill |
| Global Trade Identification Number | 00816448027451 |
| Included Components | GemFoam Reusable Rock Polisher Foam |
| Item Dimensions | 12 x 3 x 18.5 centimeters |
| Item Type Name | Rock Tumbling Media GemFoam Reusable Rock Polisher Foam |
| Item height | 7.28 inches |
| Manufacturer | Blue Marble |
| Manufacturer Maximum Age (MONTHS) | 1188.0 |
| Manufacturer Minimum Age (MONTHS) | 96.0 |
| Material Type | Foam |
| Number of Players | 1 |
| Operation Mode | Manual |
| Power Source | manual |
| Size | M |
| Sub Brand | National Geographic |
| Supported Battery Types | No batteries required |
| Theme | Fantasy |
| UPC | 816448027451 |
| Unit Count | 1.0 Count |

## Images

![Blue Marble NATIONAL GEOGRAPHIC Rock Tumbler Media - GemFoam Reusable Rock Polisher Foam, Use After Rock Tumbler Grit Cycles, Adds Shine to Tumbled Rocks and Minerals, Rock Tumbling Supplies - Image 1](https://m.media-amazon.com/images/I/91Rp1wQXT4L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ super pour la finition
*by C***O on 8 December 2021*

facile a utiliser apres avoir utiliser mon 1200 grit

### ⭐⭐⭐⭐⭐ Good purchase
*by S***. on 21 January 2026*

Great tumbler. Use it frequently with no problems.

### ⭐ Product doesnnt work
*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 United States of America*
*Store origin: US*
*Last updated: 2026-02-24*