---
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: "₨13534"
currency: LKR
in_stock: true
reviews_count: 13
category: "Blue Marble"
url: https://www.desertcart.lk/products/219854530-national-geographic-rock-tumbling-media-gemfoam-reusable-rock-polisher-foam
store_origin: LK
region: Sri Lanka
---

# 3-day polishing boost 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:** ₨13534
**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?** ₨13534 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/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.
- • **Effortless Integration:** Simply add after your final grit cycle—no extra hassle, just stunning results.
- • **Universal Compatibility:** Works seamlessly with any durable rock tumbler, especially National Geographic tumblers.
- • **Long-Lasting & Eco-Friendly:** Reusable up to 6 polishing cycles, saving you money and reducing waste.
- • **Unmatched Shine, Every Time:** GemFoam delivers a brilliant polish that elevates your rocks to museum-quality gleam.

## Overview

National Geographic's GemFoam is a reusable rock polishing foam designed to add exceptional shine to tumbled rocks after the final grit cycle. Compatible with all durable tumblers and reusable up to six times, it enhances your rock tumbling projects with minimal effort and maximum brilliance.

## 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: Great product - Worked great to tumble to a fine polish

## 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 | #1,354 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Tumbling Media |
| Customer Reviews | 4.6 4.6 out of 5 stars (18,517) |
| 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/91Rp1wQXT4L.jpg)

## Available Options

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

## Customer Reviews

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

Great tumbler. Use it frequently with no problems.

### ⭐⭐⭐⭐⭐ Great product
*by B***R on February 3, 2026*

Worked great to tumble to a fine polish

### ⭐⭐⭐⭐⭐ Decent Value for Hobbyist
*by L***S on January 21, 2026*

These are the same grits that come with the tumbler kit. The scoop that comes with it is a nice addition. I've found that some grits get used faster than others, so it may be worthwhile to find a supplier that sells individual grits. Depending on where you find your rocks, you may find that some of the heavier grits are not needed as much as the finer grits. Most rocks I've polished came from riverbeds and are fairly smooth to start with. In my experience, you can start with the 3rd grit on these and still get the desired results in less time since you can skip the first grit or two which is about 2 weeks of tumbling. Another tip, get some dishes like cake pans or casserole dishes at the dollar store and pour the water/grit from the tumbler into them and let the water evaporate. I have one pan for each grit. You can then reuse the media several times before discarding it.

## 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 Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-12*