---
product_id: 219416282
title: "National Geographic Rock Tumbler Refill Kit – Rock Tumbling Supplies Including Rock Tumbler Grit and Polish Refill, Ceramic Media, GemFoam, 3 lbs Madagascar Rocks for Tumbling, Jewelry Accessories"
brand: "blue marble"
price: "€ 74.57"
currency: EUR
in_stock: true
reviews_count: 13
category: "Blue Marble"
url: https://www.desertcart.ie/products/219416282-national-geographic-rock-tumbler-refill-kit-rock-tumbling-supplies-including
store_origin: IE
region: Ireland
---

# Ceramic media for quieter, efficient tumbling 3 lbs authentic Madagascar rocks High-quality silicon carbide grit National Geographic Rock Tumbler Refill Kit – Rock Tumbling Supplies Including Rock Tumbler Grit and Polish Refill, Ceramic Media, GemFoam, 3 lbs Madagascar Rocks for Tumbling, Jewelry Accessories

**Brand:** blue marble
**Price:** € 74.57
**Availability:** ✅ In Stock

## Summary

> ✨ Turn raw stones into radiant treasures with National Geographic’s ultimate rock tumbling kit! 🪨

## Quick Answers

- **What is this?** National Geographic Rock Tumbler Refill Kit – Rock Tumbling Supplies Including Rock Tumbler Grit and Polish Refill, Ceramic Media, GemFoam, 3 lbs Madagascar Rocks for Tumbling, Jewelry Accessories by blue marble
- **How much does it cost?** € 74.57 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/219416282-national-geographic-rock-tumbler-refill-kit-rock-tumbling-supplies-including)

## 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

- • **Polish Like a Pro:** Premium silicon carbide grit polishes up to 10 lbs of rocks to dazzling perfection
- • **Whisper-Quiet Tumbling:** Ceramic media reduces noise and rock breakage for a smoother experience
- • **STEM-Approved Fun & Quality:** Backed by National Geographic’s trusted STEM series for educational and creative excellence
- • **Next-Level Shine with GemFoam:** Patent-pending polishing media delivers an unprecedented glossy finish
- • **Treasure Your Own Madagascar Gems:** Includes 3 lbs of exotic rose quartz, jasper & more for a unique collection

## Overview

The National Geographic Rock Tumbler Refill Kit offers 3 pounds of authentic Madagascar rocks, premium silicon carbide grit, ceramic media, and innovative GemFoam polishing media. Designed to polish up to 10 lbs of rocks quietly and efficiently, this kit elevates your rock tumbling hobby with professional-grade materials and a dazzling finish, all backed by National Geographic’s STEM-certified quality.

## Description

desertcart.com: National Geographic Rock Tumbler Refill Kit – Rock Tumbling Supplies Including Rock Tumbler Grit and Polish Refill, Ceramic Media, GemFoam, 3 lbs Madagascar Rocks for Tumbling, Jewelry Accessories : 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

- POLISH INCREDIBLE ROCKS FROM MADAGASCAR - You'll have plenty of tumbling to do with 3 pounds of rocks from Madagascar. This rock refill pack can include rose quartz, jasper, and more. It's an awesome assortment of rocks you will treasure forever
- QUALITY GRIT RESULTS IN A 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
- A BRAND NEW WAY TO MAKE TUMBLED ROCKS SHINE - GemFoam is a unique new rock polisher 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
- SATISFACTION GUARANTEED - The National Geographic STEM series provides high-quality products that are a whole lot of fun If your experience is anything less than extraordinary, let us know so we can make it right for you.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08B7JBVG9 |
| Best Sellers Rank | #1,346 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Tumbling Media |
| Customer Reviews | 4.6 4.6 out of 5 stars (18,491) |
| Is Discontinued By Manufacturer | No |
| Item Weight | 3 pounds |
| Item model number | NGFOMCERGRTMD |
| Language | English |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer recommended age | 8 years and up |
| Product Dimensions | 9.84 x 7.09 x 5.51 inches |
| Release date | June 15, 2020 |

## Product Details

- **Brand:** Blue Marble
- **Style:** Complete Starter Kit
- **Theme:** media
- **Recommended Uses For Product:** Travel, Home
- **Included Components:** (function(f) {var _np=(window.P._namespace("DetailPageProductOverviewTemplatesJava"));if(_np.guardFatal){_np.guardFatal(f)(_np);}else{f(_np);}}(function(P) {
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}));  Jewelry Fastenings, 10 mL Grit Scoop, 1.5 pounds of Ceramic Media, 4 Stages of Silicon Carbide Polishing Grit Compound, 3 Pound Madagascar Rock Refill Mix, 30 g GemFoam, Detailed Learning Guide with InstructionsJewelry Fastenings, 10 mL Grit Scoop,…    See more

## Images

![National Geographic Rock Tumbler Refill Kit – Rock Tumbling Supplies Including Rock Tumbler Grit and Polish Refill, Ceramic Media, GemFoam, 3 lbs Madagascar Rocks for Tumbling, Jewelry Accessories - Image 1](https://m.media-amazon.com/images/I/91d7DbkcfYL.jpg)

## Available Options

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

## Questions & Answers

**Q: How many oz is in each container?**
A: 1 Coarse-16oz.  2 Medium-13oz.  3 Pre-polish-12oz.  4 Polish-11.5 oz.

**Q: I just opened this and finished with grit one,  went to put grit 2 in and bottle open and 1/2 full. How do I contact seller?**
A: I would go through Amazon to get an answer for your problem.

**Q: Can it be used together ?**
A: Each grit is a different fineness intended for a specific purpose. We do not recommend using them at the same time.  We do recommend 1 TBS grit per per 1 LB rocks, at each cycle. For further information please contact us at help@natgeotoys.com.

**Q: After each step for the rocks in the kit, my rocks dry with a dull white finish.  It doesn't show when it is wet. Am I doing something wrong?**
A: No.  I find that after tumbling with the finest grit after the last step... and thoroughly allowing the rocks to dry, a nice coat of wax or oil brings out the color beautifully.

## 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.

### ⭐⭐⭐⭐⭐ 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

- NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit – Rock Tumbling Supplies including Rock Tumbler Grit and Polish Refill, Ceramic Media, GemFoam, 3 lbs Madagascar Rocks for Tumbling, Jewelry Accessories
- National Geographic Rock Tumbler Kit - 3 Lb. Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Kit Includes Rocks for Tumbling and Rock Polisher Grit, Rock Tumbler for Adults and Kids
- National Geographic Rock Tumbler Refill Kit – 3 lbs. of Rough Gemstones and Rocks for Tumbling Including Amethyst and Quartz – Rock Tumbler Supplies Include Rock Tumbler Grit and Jewelry Accessories

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-26*