---
product_id: 646717444
title: "National Geographic Rock Tumbler Mega Refill Kit - 1.35kg Gemstones of 9 Varieties Including Tiger's Eye, Amethyst & Quartz - 4 Grades of Grit, Jewellery Fastenings & Detailed Learning Guide"
brand: "blue marble"
price: "€ 181.17"
currency: EUR
in_stock: false
reviews_count: 5
url: https://www.desertcart.gr/products/646717444-national-geographic-rock-tumbler-mega-refill-kit-1-35kg-gemstones
store_origin: GR
region: Greece
---

# 9 gemstone varieties Detailed STEM learning guide 4 polishing grit grades National Geographic Rock Tumbler Mega Refill Kit - 1.35kg Gemstones of 9 Varieties Including Tiger's Eye, Amethyst & Quartz - 4 Grades of Grit, Jewellery Fastenings & Detailed Learning Guide

**Brand:** blue marble
**Price:** € 181.17
**Availability:** ❌ Out of Stock

## Summary

> 💎 Polish your passion, wear your story.

## Quick Answers

- **What is this?** National Geographic Rock Tumbler Mega Refill Kit - 1.35kg Gemstones of 9 Varieties Including Tiger's Eye, Amethyst & Quartz - 4 Grades of Grit, Jewellery Fastenings & Detailed Learning Guide by blue marble
- **How much does it cost?** € 181.17 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/646717444-national-geographic-rock-tumbler-mega-refill-kit-1-35kg-gemstones)

## 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

- • **STEM-Backed Educational Fun:** Comes with a detailed guide packed with fascinating facts
- • **Create Custom Jewelry Masterpieces:** Includes necklace, earrings, keychain & ring fastenings
- • **Explore 9 Unique Gemstone Varieties:** From Tiger's Eye to Amethyst, a collector’s dream
- • **Trusted National Geographic Quality:** Premium materials and expert craftsmanship for lasting enjoyment
- • **Transform Rough Rocks into Dazzling Gems:** 4-step grit system polishes stones to perfection

## Overview

The National Geographic Rock Tumbler Mega Refill Kit offers 1.35 kg of nine diverse raw gemstones, four grades of polishing grit, and six jewelry fastenings, empowering users to transform rough stones into stunning, wearable art. Designed for STEM learning and creative expression, it includes a detailed educational guide and is crafted with National Geographic’s renowned quality standards.

## Description

Keep the Fun Rolling with National Geographic's Mega Gemstone Refill Kit. If you love your National Geographic Rock Tumbler, the Mega Gemstone Refill Kit is the perfect way to keep creating gorgeous gems you can collect, wear, and display. This gemstone refill kit includes: 9 types of raw gemstones (1.35 kg in total), 4 courses of polishing grit, 6 jewellery fastenings, 1 full-colour learning guide. National Geographic Toys makes the highest quality hands-on science toys, and all products are backed by exceptional service. About the National Geographic Society: 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: Det var bra med sten
Review: Son Loved it! great product, with great quality. Cool hobby to have

## Features

- GEMSTONES OF NINE VARIETIES: Tiger's Eye, Amethyst, Aventurine, Rose Quartz, Red Jasper, Agate, Sodalite, Dalmatian Jasper, Hematite (1.35 kg total)
- FOUR GRADES OF GRIT: Coarse, Medium, Fine, Polish. Transform your stones from rough rocks to dazzling gemstones!
- JEWELLERY FASTENINGS: 1 necklace, 1 set of earrings, 1 keychain, 1 ring. Create custom jewellery from your newly polished gemstones!
- LEARNING GUIDE: Our learning guide will teach you all about these unique gemstone specimens and includes many amazing and fascinating facts
- SATISFACTION GUARANTEED – The National Geographic STEM series provides kids high-quality educational toys 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 | B07H7WFWYT |
| Assembly Required | No |
| Batteries Included | No |
| Batteries Required | No |
| Colour | roses |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,607) |
| Date First Available | 25 March 2022 |
| Educational Objective(s) | STEM |
| Generic Name | Mega Gemstone Rock Tumbler Refill Kit |
| Included Components | 1.35kg Gemstones of 9 Varieties, 4 Grades of Grit, Jewellery Fastenings & Detailed Learning Guide |
| Item Dimensions LxWxH | 13.6 x 13.5 x 13.8 Centimeters |
| Item Weight | 1 kg 360 g |
| Item model number | NGGEMREFILLMEGA |
| Language | English |
| Manufacturer | JMW Sales< Inc. |
| Manufacturer recommended age | 8 years and up |
| Material Type(s) | Gemstones |
| Model Number | NGGEMREFILLMEGA |
| Net Quantity | 1.0 Count |
| Number of Puzzle Pieces | 9 |
| Product Dimensions | 13.65 x 13.5 x 13.81 cm; 1.36 kg |
| Remote Control Included? | No |
| tech_spec_battery_description_toys | No batteries required |

## Product Details

- **Brand:** Blue Marble
- **Age Range (Description):** Kid
- **Colour:** roses
- **Theme:** Nature
- **Cartoon Character:** Gemstones

## Images

![National Geographic Rock Tumbler Mega Refill Kit - 1.35kg Gemstones of 9 Varieties Including Tiger's Eye, Amethyst & Quartz - 4 Grades of Grit, Jewellery Fastenings & Detailed Learning Guide - Image 1](https://m.media-amazon.com/images/I/41dtP4opmDL.jpg)
![National Geographic Rock Tumbler Mega Refill Kit - 1.35kg Gemstones of 9 Varieties Including Tiger's Eye, Amethyst & Quartz - 4 Grades of Grit, Jewellery Fastenings & Detailed Learning Guide - Image 2](https://m.media-amazon.com/images/I/513NSy3ntKL.jpg)
![National Geographic Rock Tumbler Mega Refill Kit - 1.35kg Gemstones of 9 Varieties Including Tiger's Eye, Amethyst & Quartz - 4 Grades of Grit, Jewellery Fastenings & Detailed Learning Guide - Image 3](https://m.media-amazon.com/images/I/51PsvhHlG5L.jpg)
![National Geographic Rock Tumbler Mega Refill Kit - 1.35kg Gemstones of 9 Varieties Including Tiger's Eye, Amethyst & Quartz - 4 Grades of Grit, Jewellery Fastenings & Detailed Learning Guide - Image 4](https://m.media-amazon.com/images/I/51bjL2VBp8L.jpg)
![National Geographic Rock Tumbler Mega Refill Kit - 1.35kg Gemstones of 9 Varieties Including Tiger's Eye, Amethyst & Quartz - 4 Grades of Grit, Jewellery Fastenings & Detailed Learning Guide - Image 5](https://m.media-amazon.com/images/I/51mtsK-8rnL.jpg)

## Questions & Answers

**Q: how many pounds of rocks can the grit tumble**
A: The instructions for the Tumbler does not give a specific weight. It recommends not filling the Tumbler barrel more than 1/2 to 2/3 full. If you overfill the Tumbler, the built-in sensor will automatically protect the motor inside by turning the Tumbler off. It further recommends if this happens you should remove some of the rocks.The grit to be used in the Tumbler comes in premeasured packets for the Tumbler size itself.  I hope this helps.

**Q: Are these uncut gemstones sourced ethically? Can you provide evidence if so?**
A: I only buy from reliable dealers. I buy a lot from National Geographic through Amazon. I’m not sure where I can find proof. I’m sorry I couldn’t give you a better answer.

**Q: Where were the rock mined?**
A: I think they were mined in Madagascar.

**Q: Does this kit list the Mohs hardness of the different stones? I know you're not supposed to polish rocks with different hardness together**
A: No, there is not a Mohs hardness scale included in this kit, but you should be able to locate a copy online.

## Customer Reviews

### ⭐⭐⭐ Review
*by Z***M on 9 October 2023*

Det var bra med sten

### ⭐⭐⭐⭐⭐ Review
*by B***Y on 16 August 2025*

Son Loved it! great product, with great quality. Cool hobby to have

### ⭐⭐⭐⭐⭐ Review
*by T***. on 18 July 2022*

Den Tumbler besitze ich schon ganz lange, dieser hat sich nach den Bildern nicht groß verändert. Daher bewerte ich diesen hier zusätzlich. Er tut seinen Dienst, lässt sich easy reinigen und ist sehr robust. Der O-Ring lässt sich einfach austauschen und auch nach Jahren funktioniert alles noch super. Vor kurzem hab ich mir dann, nachdem ich den Tumbler wieder fit gemacht hatte, die Nachfüllpackung für 40€ gekauft. Was soll ich sagen? Es sind wirklich große Steine dabei! Das ist nun der erste Beutel der drei und ich kann mich nicht beschweren. Das mitgelieferte Polierkies funktioniert auch super, nur zum Schluss bekommt das Ganze noch einen Keramik Durchgang, sonst werden die Steine nicht glänzen. Das ist der einzige minus Punkt bei dem Tumbler/Nachfülle bzw. bei dem mitgelieferten Kies. Die Steine glänzen zum Schluss leider nicht ohne extra Schritt. Das Bild oben ist nach der ersten groben Politur entstanden, wenn ich daran denke, folgt ein Bild mit dem Resultat nach poliergang 5 laut Anleitung der finale Schritt. P.s. poliert am besten immer mit der längsten Zeit! Das klappt am besten!

## Frequently Bought Together

- 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
- 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
- Blue Marble National Geographic Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with Any Rock Polisher, Rock Tumbler Supplies

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-01-24*