---
product_id: 325627783
title: "National Geographic Rock Tumbler Media - the Ultimate Rock Polishing Supplies Kit,4 Stage,0.7kg of Ceramic Pellets"
brand: "blue marble"
price: "€ 113.74"
currency: EUR
in_stock: true
reviews_count: 5
category: "Blue Marble"
url: https://www.desertcart.pt/products/325627783-national-geographic-rock-tumbler-media-the-ultimate-rock-polishing-supplies
store_origin: PT
region: Portugal
---

# Patented GemFoam for unmatched rock shine 0.7kg ceramic pellets reduce noise & breakage 4-stage silicon carbide grit for precision polishing National Geographic Rock Tumbler Media - the Ultimate Rock Polishing Supplies Kit,4 Stage,0.7kg of Ceramic Pellets

**Brand:** blue marble
**Price:** € 113.74
**Availability:** ✅ In Stock

## Summary

> ✨ Transform your rocks from rough to remarkable—shine like a pro! 🪨

## Quick Answers

- **What is this?** National Geographic Rock Tumbler Media - the Ultimate Rock Polishing Supplies Kit,4 Stage,0.7kg of Ceramic Pellets by blue marble
- **How much does it cost?** € 113.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/325627783-national-geographic-rock-tumbler-media-the-ultimate-rock-polishing-supplies)

## 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

- • **GemFoam Brilliance:** Add the patented GemFoam for a dazzling, museum-quality polish that turns heads.
- • **Ceramic Media Magic:** Quiet your tumbler and protect your gems with 0.7kg of noise-dampening, breakage-reducing pellets.
- • **Universal Compatibility:** Works seamlessly with any rock tumbler—upgrade your setup without limits.
- • **Precision 4-Stage Polishing:** From rough to radiant—silicon carbide grit sculpts and shines every stone.
- • **Award-Winning Quality & Support:** Backed by National Geographic and Toy of the Year winner Blue Marble, with expert U.S.-based customer care.

## Overview

The National Geographic Rock Tumbler Media Kit features a complete 4-stage silicon carbide grit system, 0.7kg of ceramic pellets to enhance tumbling efficiency and reduce noise, plus patented GemFoam media for superior polish. Compatible with all rock tumblers, this award-winning kit delivers professional-grade results and is backed by expert support.

## Description

The National Geographic Rock Tumbler Supplies pack includes all the rock tumbling accessories you need to dramatically improve your rock polishing results! Pack Includes: 4 Stages of Silicon Carbide Polishing Grit Compound, 1.5 Pounds of Ceramic Media, 30 g GemFoam, 10 mL Scoop and Instructions. Our 4-stage bulk rock tumbling grit is high-quality silicon carbide, perfect for polishing rough rocks into smooth gemstones. The first rock tumbler grit stage provides initial shaping, the second smooths rock surfaces, the third pre-polishes rocks, and the fourth provides the final polish. We include a 10 mL grit scoop so you can get precise measurements for every stage. Grit comes packaged in secure, screw-top containers for easy storage. And when you add our ceramic tumbling pellets to the mix, you will see even better results! Ceramic media helps to more effectively distribute grit to rock surfaces during tumbling, reduces tumbler noise, serves as filler for smaller batches, and reduces rock breakage through every grit cycle. One of the most exciting elements of this tumbling accessories pack is our new patent-pending GemFoam. This tumbling media was specially designed to add dazzling shine to polished stones. Simply add GemFoam, water, and rocks to the tumbler barrel and in a few days your stones will have a high-quality polish. Instructions inside the kit detail how to use all the tumbling media for optimal results. This pack is compatible with all rock tumblers, but for best results use with National Geographic rock tumblers and tumbling accessories. We make the highest quality hands-on science products, and all are backed by exceptional service. 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: exactly as pictured
Review: I am surprised at how well this kit works. Just follow the instructions and you’ll have wonderfully polished rocks. I bought this kit and a separate tumbler just out of curiosity. I have so many rocks on the shelf now I’m sure my wife is hiding them. Definitely worth the purchase.

## Features

- QUALITY RESULTS AND DAZZLING POLISH - The rock polishing grit in this pack is high-quality silicon carbide and will polish 8-10 lbs of rocks. Includes measuring scoop and storage containers with secure screw-top closures for easy storage.
- IMPROVE YOUR ROCK TUMBLING RESULTS – Ceramic tumbler media makes the entire rock tumbling process more effective, improving delivery of rock tumbling grit, quieting tumbler noise, reducing rock breakage, and acting as a filler for smaller batches.
- PATENTED WAY TO MAKE TUMBLED ROCKS SHINE – GemFoam is a unique, patented rock polisher media that gives unprecedented shine to tumbled rocks. Just add GemFoam to your tumbler after the final grit cycle for great results!
- WORKS WITH ANY ROCK TUMBLER – The tumbling supplies in this set are safe to use with any rock tumbler. The tumbling grit, ceramic pellets, and GemFoam together improve rock tumbling performance and yield impressive results.
- 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 | B08B7GRBK6 |
| Assembly Required | No |
| Batteries Included? | No |
| Batteries Required? | No |
| Color | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,987) |
| Date First Available | 2 September 2020 |
| Educational Objective(s) | STEM |
| Item model number | NGFOMCERGRIT |
| Manufacturer recommended age | 8 years and up |
| Material Type(s) | Rock |
| Number of Game Players | 1 |
| Product Dimensions | 19 x 13.51 x 13.89 cm; 2.52 kg |
| Remote Control Included? | No |
| tech_spec_battery_description_toys | No batteries required |

## Images

![National Geographic Rock Tumbler Media - the Ultimate Rock Polishing Supplies Kit,4 Stage,0.7kg of Ceramic Pellets - Image 1](https://m.media-amazon.com/images/I/91oyBF1mZaL.jpg)

## Questions & Answers

**Q: Can Gemfoam be purchased separately?**
A: Yes, we do sell the Polishing Foam separately.

**Q: What is the difference between this and product # ngbulkgrit?**
A: Thank you so much for your inquiry. This item (the Complete Media Kit) contains the grit along with GemFoam to assist in the polishing stage and Ceramic Pellets to reduce rock breakage along with making the  tumbling process more quiet. The Bulk Grit does not contain the GemFoam or pellets, but does contain the grit.

**Q: How much of each medium is included in this accessories set?**
A: The jars shown hold approximately 2/3 of a cup, so plan on buying bulk bags in the near future.

**Q: My lid cracked and i need a new one. Are there replacement parts avaliable to buy?**
A: Not sure if you are referring to the tumbler canister lid but you will find replacement parts on Ebay under rock tumbler parts

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by S***E on 26 February 2025*

exactly as pictured

### ⭐⭐⭐⭐⭐ Review
*by K***Y on 28 August 2025*

I am surprised at how well this kit works. Just follow the instructions and you’ll have wonderfully polished rocks. I bought this kit and a separate tumbler just out of curiosity. I have so many rocks on the shelf now I’m sure my wife is hiding them. Definitely worth the purchase.

### ⭐⭐⭐⭐⭐ Review
*by R***T on 17 June 2024*

This kit contains all that is required to produce polished stones of a high standard. The gemfoam gives a quality polish to be proud of. Those who tumble more often may require a bulk buy but this kit would suit most hobbyist.

## Frequently Bought Together

- Blue Marble National Geographic Rock Tumbler Media – The Ultimate Rock Polishing Supplies Kit, 4 Stage Bulk Grit, 1.5 Pounds of Ceramic Pellets, GemFoam Polishing Tumbling Media
- National Geographic Rock Tumbler Kit – Hobby Edition Includes Rough Gemstones, and 4 Polishing Grits, Great STEM Science Kit for Geology Enthusiasts, Rock Polisher for Kids and Adults
- 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 Portugal*
*Store origin: PT*
*Last updated: 2026-01-24*