---
product_id: 219854530
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: "$48"
currency: NZD
in_stock: true
reviews_count: 13
category: "Blue Marble"
url: https://www.desertcart.nz/products/219854530-national-geographic-rock-tumbling-media-gemfoam-reusable-rock-polisher-foam
store_origin: NZ
region: New Zealand
---

# 3-day polishing duration Up to 6 reuse cycles Compatible with any tumbler 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:** $48
**Availability:** ✅ In Stock

## Summary

> 💎 Elevate your rock game—shine like never before!

## 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?** $48 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/219854530-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, ensuring trusted innovation and support.
- • **Unmatched Shine Boost:** GemFoam delivers a brilliant polish that elevates your rocks to museum-quality gleam.
- • **Effortless Final Touch:** Simply add after grit cycles for a hassle-free shine upgrade in just 3 days.
- • **Long-Lasting & Reusable:** Use the same pack up to 6 times—sustainability meets performance.
- • **Universal Compatibility:** Works seamlessly with any durable rock tumbler for effortless integration.

## Overview

The NATIONAL GEOGRAPHIC GemFoam Rock Polisher is a reusable foam media designed to add exceptional shine to tumbled rocks after grit cycles. Compatible with any durable tumbler, it can be reused up to 6 times and requires just 3 days of tumbling for a polished finish. Developed by an award-winning brand, it enhances your rock tumbling projects with professional-grade results.

## Description

desertcart.com: 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 : Industrial & Scientific

Review: Good purchase - Great tumbler. Use it frequently with no problems.
Review: Good quality. - My first experience with a rock tumbler and I love it. Works just as explained in the directions.

## 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 |
| Best Sellers Rank | #1,250 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Tumbling Media |
| Customer Reviews | 4.6 4.6 out of 5 stars (18,468) |
| Item Weight | 1.23 ounces |
| Item model number | NGFOMBAG |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer recommended age | 8 years and up |
| Product Dimensions | 4.72 x 1.18 x 7.28 inches |
| Release date | July 15, 2020 |

## 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/81EDOrxkv2L.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/81eikxNPvZL.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/81hKCnEed3L.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/91H0Dew3jkL.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/91MlvzIiF7L.jpg)

## Customer Reviews

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

Great tumbler. Use it frequently with no problems.

### ⭐⭐⭐⭐⭐ Good quality.
*by J***E on December 19, 2025*

My first experience with a rock tumbler and I love it. Works just as explained in the directions.

### ⭐⭐⭐⭐⭐ My first run outcome
*by B***T on November 30, 2025*

Im a kid again with this stuff! Easy to use, idiot proof instructions! Great outcomes.

## 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 New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-18*