---
product_id: 344915911
title: "NATIONAL GEOGRAPHIC Rock Tumbler Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, Great STEM Science Kit for Boys and Girls"
brand: "blue marble"
price: "₨230958"
currency: LKR
in_stock: true
reviews_count: 5
category: "Blue Marble"
url: https://www.desertcart.lk/products/344915911-national-geographic-rock-tumbler-kit-3lb-extra-large-capacity-3lb
store_origin: LK
region: Sri Lanka
---

# 75% quieter stainless steel lid Automatic shutoff timer with speed control 3LB extra-large capacity barrel NATIONAL GEOGRAPHIC Rock Tumbler Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, Great STEM Science Kit for Boys and Girls

**Brand:** blue marble
**Price:** ₨230958
**Availability:** ✅ In Stock

## Summary

> 💎 Elevate your hobby—polish, shine, and own the gem game!

## Quick Answers

- **What is this?** NATIONAL GEOGRAPHIC Rock Tumbler Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, Great STEM Science Kit for Boys and Girls by blue marble
- **How much does it cost?** ₨230958 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/344915911-national-geographic-rock-tumbler-kit-3lb-extra-large-capacity-3lb)

## 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 Magic:** Innovative reusable polisher delivers an unmatched, brilliant shine every time.
- • **STEM Meets Style:** Includes 5 jewelry fastenings to transform your creations into wearable art.
- • **Set It & Forget It:** Customizable timer and speed controls let you perfect every polish without babysitting.
- • **Whisper-Quiet Precision:** Enjoy a 75% noise reduction thanks to the leak-proof stainless steel barrel lid.
- • **Master the Art of Gem Polishing:** Turn 3 lbs of rough gemstones into dazzling treasures with ease.

## Overview

The National Geographic Rock Tumbler Kit features a durable 3-pound capacity barrel with a leak-proof stainless steel lid that operates 75% quieter than plastic alternatives. Equipped with an automatic shutoff timer and adjustable speed settings, it simplifies the tumbling process. The kit includes 3 lbs of assorted rough gemstones, four polishing grits, five jewelry fastenings, and the exclusive reusable GemFoam polisher for a brilliant finish. Designed for STEM learning and creative expression, this award-winning kit is perfect for aspiring geologists and jewelry makers alike.

## Description

Take your rock tumbling seriously with this top-of-the-line, three-pound capacity professional rock tumbling kit from National Geographic! This kit has all the features and accessories you’ll need to master rock tumbling, start an extraordinary rock collection, and create beautiful jewelry. Contents and Features: Automatic shutoff timer; Reliable, long-lasting motor; Leak-proof tumbler barrel; Noise-reduced operation (75% quieter than plastic barrels); Plenty of stones (3 lb) and four levels of grit; 5 Jewelry Fastenings; GemFoam, the most innovative way to add dazzling shine to your polished stones! This high-quality tumbler allows you to set your speed and tumbling time. When the time expires, your tumbler will automatically shut-off, allowing you to choose the perfect amount of tumble time for each grit stage. Plus, our redesigned tumbling barrel dampens sound better than most tumblers out there. The rough rocks provided (3 lbs) contain nine different gemstones from around the world, and our tumbling grit is labeled by tumbling stage to make the process even easier! Choose your favorite gems and turn them into jewelry with the included necklace, keychain, ring, and two clip-on earring fastenings inside. And don't forget about GemFoam, our exclusive new way to add dazzling shine to your polished rocks! Use GemFoam just like tumbling grit, simply add it to the barrel with your stones and water, then three days later marvel at the shine! GemFoam is reusable too, allowing you to create a truly impressive gemstone collection! National Geographic Toys is proud to provide only the highest quality products, each backed by a complete satisfaction guarantee so that you can buy with confidence. The National Geographic Society is one of the world’s largest nonprofit scientific and educational organizations.

Review: My Nat. Geo. 3lb rock tumbler arrived the next day I placed my order with desertcart AU Brilliant service and very well packed. Within 30 mins I put it to wok. Absolutely no surprises or disappointments as i fully researched it on YouTube [ Robs Mitchan Rocks ] I highly recommend this product and service from desertcart Aust.
Review: Ho 67 anni, nel 2023 ho acquistato questo articolo e, con mia grande sorpresa, mi ha regalato 1 anno e mezzo di grandi soddisfazioni! Ho burattato semplicemente sassi di mare, nessuna pietra di valore dunque, ma la soddisfazione forse è proprio questa: "mettere a nudo la loro bellezza nascosta"! Grazie a questa macchina ho aggiunto un super hobby al mio tempo di insegnante volontaria in pensione, proverò con il mercatino per la scuola a far conoscere ai bambini questa bellissima attività! Tre giorni fa la macchina ha avuto un problema, ma è stato subito risolto, ringrazio national geographic per la sollecita e graditissima soluzione trovata per me! CONSIGLIATISSIMO!

## Features

- CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This professional rock tumbler makes it fun and easy to turn rough rocks into beautifully polished gemstones, thanks to its simple operation and durable design.
- A TUMBLER THAT'S MADE TO LAST - The durable motor has time and speed control settings so you can set it, and forget it. An improved, leak-proof barrel features a stainless-steel lid is 75% quieter overall than plastic tumbler barrels.
- INCLUDES 3 LBS. OF ROCKS & MORE - This tumbling kit comes with everything you need: 3 lbs. of raw rocks with 9 types of gemstones, 5 jewelry fastenings, grit, strainer & GemFoam for a dazzling shine!
- USE GEMFOAM FOR DAZZLING RESULTS - This rock tumbler kit stands apart from others thanks to our new, reusable GemFoam rock polisher! Add GemFoam and water to the barrel after your final tumbling stage and your gems will have incredible 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 | B08DL95CWL |
| Assembly Required | No |
| Batteries Included | No |
| Batteries Required | Yes |
| Customer Reviews | 4.5 4.5 out of 5 stars (4,654) |
| Date First Available | 3 August 2020 |
| Educational Objective(s) | STEM, Concept Development Skills, Hand-Eye Coordination, Critical Thinking, Reasoning Exploratory Skills |
| Generic Name | Rock Tumbler Kit - 3 Lb. Extra Large Capacity Barrel |
| Included Components | 3lb Assorted Rough Gems, 4 Stages of Polishing Grit, 5 Jewelry Settings, Complete Rock Tumbler Kit, GemFoam Final Stage Rock Polisher, X-Large 3lb Capacity Barrel |
| Item Dimensions LxWxH | 32.4 x 26.2 x 17 Centimeters |
| Item Weight | 3 kg 700 g |
| Item model number | NGTUMBLER3LB |
| Language | English |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer recommended age | 8 years and up |
| Material Type(s) | Plastic Stainless Steel |
| Model Number | NGTUMBLER3LB |
| Net Quantity | 1.0 Count |
| Number of Game Players | 1 |
| Product Dimensions | 32.4 x 26.2 x 17 cm; 3.7 kg |
| Remote Control Included? | No |

## Product Details

- **Age Range (Description):** 8 years and up
- **Brand:** Blue Marble
- **Item dimensions L x W x H:** 32.4 x 26.2 x 17 Centimeters
- **Size:** One Size
- **Theme:** Geology

## Images

![NATIONAL GEOGRAPHIC Rock Tumbler Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, Great STEM Science Kit for Boys and Girls - Image 1](https://m.media-amazon.com/images/I/512W9ijQr-L.jpg)
![NATIONAL GEOGRAPHIC Rock Tumbler Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, Great STEM Science Kit for Boys and Girls - Image 2](https://m.media-amazon.com/images/I/514LlKNDVSL.jpg)
![NATIONAL GEOGRAPHIC Rock Tumbler Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, Great STEM Science Kit for Boys and Girls - Image 3](https://m.media-amazon.com/images/I/516km0vhadL.jpg)
![NATIONAL GEOGRAPHIC Rock Tumbler Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, Great STEM Science Kit for Boys and Girls - Image 4](https://m.media-amazon.com/images/I/51Cb-mvr07L.jpg)
![NATIONAL GEOGRAPHIC Rock Tumbler Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, Great STEM Science Kit for Boys and Girls - Image 5](https://m.media-amazon.com/images/I/51Esj6WzYDL.jpg)

## Questions & Answers

**Q: Warranty on motor**
A: All our tumblers include a 1-2 year warranty.  For warranty assistance please contact us using the contact information found on the bottom of the package or in the instruction guide.

**Q: Why is it saying undeliverable to any of my US addresses?**
A: I experienced the same; it would not ship to my po box.  I had it shipped to my daughter's house; it seem to like her address.

**Q: What are the inside measurements of the 3lb barrel?**
A: Our 3 lb barrel is approximately 3.25" x 5.5"

**Q: How much does the barrel weigh?**
A: Our 3 pound barrel with lid weighs 2 pounds.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by R***T on 6 May 2024*

My Nat. Geo. 3lb rock tumbler arrived the next day I placed my order with Amazon AU Brilliant service and very well packed. Within 30 mins I put it to wok. Absolutely no surprises or disappointments as i fully researched it on YouTube [ Robs Mitchan Rocks ] I highly recommend this product and service from Amazon Aust.

### ⭐⭐⭐⭐⭐ Review
*by C***N on 5 March 2025*

Ho 67 anni, nel 2023 ho acquistato questo articolo e, con mia grande sorpresa, mi ha regalato 1 anno e mezzo di grandi soddisfazioni! Ho burattato semplicemente sassi di mare, nessuna pietra di valore dunque, ma la soddisfazione forse è proprio questa: "mettere a nudo la loro bellezza nascosta"! Grazie a questa macchina ho aggiunto un super hobby al mio tempo di insegnante volontaria in pensione, proverò con il mercatino per la scuola a far conoscere ai bambini questa bellissima attività! Tre giorni fa la macchina ha avuto un problema, ma è stato subito risolto, ringrazio national geographic per la sollecita e graditissima soluzione trovata per me! CONSIGLIATISSIMO!

### ⭐⭐⭐⭐⭐ Review
*by B***R on 3 February 2026*

Works great

## Frequently Bought Together

- 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
- 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
- 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 Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-04*