---
product_id: 257605860
title: "NATIONAL GEOGRAPHIC (Complete Starter Kit) - Rock Tumbler Media - Rock Polisher Tumbler Kit, 4 Stage Rock Tumbler Grit and Polish, Ceramic Pellets, GemFoam Polishing Foam, 1.4kg Madagascar Rocks, G..."
brand: "blue marble"
price: "€ 250.99"
currency: EUR
in_stock: true
reviews_count: 5
category: "Blue Marble"
url: https://www.desertcart.hr/products/257605860-national-geographic-complete-starter-kit-rock-tumbler-media-rock-polisher
store_origin: HR
region: Croatia
---

# Ceramic media reduces noise & breakage 3 lbs authentic Madagascar rocks 4-stage silicon carbide grit system NATIONAL GEOGRAPHIC (Complete Starter Kit) - Rock Tumbler Media - Rock Polisher Tumbler Kit, 4 Stage Rock Tumbler Grit and Polish, Ceramic Pellets, GemFoam Polishing Foam, 1.4kg Madagascar Rocks, G...

**Brand:** blue marble
**Price:** € 250.99
**Availability:** ✅ In Stock

## Summary

> ✨ Transform Rough Rocks into Dazzling Gems — Your Desk’s New Conversation Starter!

## Quick Answers

- **What is this?** NATIONAL GEOGRAPHIC (Complete Starter Kit) - Rock Tumbler Media - Rock Polisher Tumbler Kit, 4 Stage Rock Tumbler Grit and Polish, Ceramic Pellets, GemFoam Polishing Foam, 1.4kg Madagascar Rocks, G... by blue marble
- **How much does it cost?** € 250.99 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/257605860-national-geographic-complete-starter-kit-rock-tumbler-media-rock-polisher)

## 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

- • **Next-Level Shine:** Patent-pending GemFoam polishing media adds an unprecedented glossy finish
- • **STEM Meets Style:** Includes jewelry fastenings to turn your polished gems into wearable art
- • **Polish Like a Pro:** 4-stage silicon carbide grit delivers museum-quality shine on every rock
- • **Whisper-Quiet Tumbling:** Ceramic pellets minimize noise and protect your precious stones from damage
- • **Authentic Madagascar Mix:** 3 pounds of rare rose quartz, jasper & more for endless tumbling excitement

## Overview

The National Geographic Complete Starter Kit offers a premium 4-stage silicon carbide grit system, 3 pounds of authentic Madagascar rocks, and innovative ceramic media to ensure quieter, more effective tumbling with less breakage. Featuring the exclusive GemFoam polishing media for an unmatched shine, this all-in-one kit includes everything from grit scoops to jewelry fastenings, making it perfect for STEM enthusiasts and creative professionals eager to craft polished stones and unique accessories.

## Description

The National Geographic Mega Rock Media kit is a one-stop rock tumbling kit for enthusiasts and beginners alike! This Kit Includes: 3 Pound Madagascar Rock Refill Mix, 4 Stages of Silicon Carbide Polishing Grit Compound, 1.5 pounds of Ceramic Media, 30 g GemFoam, 10 mL Grit Scoop, Jewelry Fastenings, Learning Guide with Instructions. Our 4-stage bulk rock tumbling grit is high-quality silicon carbide, perfect for polishing the 3 pounds of Madagascar rocks in the kit. The first 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. Add our ceramic tumbling pellets to the mix and you'll see even better results! Ceramic media helps 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 designed to add dazzling shine to polished stones. Simply tumble polished rocks with GemFoam for a high-quality shine. Instructions inside the kit detail how to use all the tumbling media for optimal results. Pick your favorites and use the jewelry fastenings to create gifts for friends or family! This pack is compatible with all tumblers, but for best results use with National Geographic tumblers and tumbling accessories. National Geographic Toys makes the highest quality hands-on science toys, and all products are backed by exceptional service. The National Geographic Society is one of the world’s largest nonprofit scientific and educational organizations.

Review: die Größe ist ok, es reicht für einige Durchgänge in der Steinetrommel
Review: Ideal hobby rock tumbler

## 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
- 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 |
| Assembly Required | No |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #82,858 in Toys ( See Top 100 in Toys ) #1,233 in Educational Science Kits |
| Color | multicoloured |
| Customer Reviews | 4.6 4.6 out of 5 stars (865) |
| Date First Available | 22 July 2020 |
| Educational Objective(s) | Development fine motor skills, patience and follow instructions |
| Item model number | NGFOMCERGRTMD |
| Language | English |
| Manufacturer recommended age | 8 - 8 years |
| Material Care Instructions | Hand Wash Only |
| Material Type(s) | Rocks, Silicon Carbide, Ceramic, GemFoam, Metal |
| Number of Game Players | 1 |
| Number of Puzzle Pieces | 1 |
| Product Dimensions | 25 x 18 x 14 cm; 1.36 kg |
| Radio Control Suitability | Rock Tumbling Media for Polishing Rough Gemstones and Rocks |
| Remote Control Included? | No |
| tech_spec_battery_description_toys | No batteries required |

## Product Details

- **Brand:** Blue Marble
- **Material:** Rocks, Silicon Carbide, Ceramic, GemFoam, Metal
- **Colour:** Multicolor
- **Special features:** GemFoam
- **Style:** Complete Starter Kit

## Images

![NATIONAL GEOGRAPHIC (Complete Starter Kit) - Rock Tumbler Media - Rock Polisher Tumbler Kit, 4 Stage Rock Tumbler Grit and Polish, Ceramic Pellets, GemFoam Polishing Foam, 1.4kg Madagascar Rocks, G... - 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

### ⭐⭐⭐⭐⭐ Review
*by A***R on 20 December 2024*

die Größe ist ok, es reicht für einige Durchgänge in der Steinetrommel

### ⭐⭐⭐⭐⭐ Review
*by A***R on 4 December 2025*

Ideal hobby rock tumbler

### ⭐⭐⭐⭐⭐ Review
*by A***A on 15 May 2023*

Tras 28 días (7 días por step) y 3 días con GemFoam, conseguí que mis piedras brillasen y estuviesen lisas. La verdad es que no obtuve estos resultados a la primera, es un proceso lento, pero gracias a informarme y a prueba-fallo, conseguí que quedasen bien. Y el GemFoam posiblemente ha sido el causante del brillo.

## 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 Croatia*
*Store origin: HR*
*Last updated: 2026-03-11*