---
product_id: 294396871
title: "Blue Marble NATIONAL GEOGRAPHIC Rock Tumbling Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, an Educational STEM Science Kit"
brand: "blue marble"
price: "1547 Lei"
currency: RON
in_stock: true
url: https://www.desertcart.ro/products/294396871-blue-marble-national-geographic-rock-tumbling-kit-3lb-extra-large
store_origin: RO
region: Romania
---

# GemFoam for dazzling shine 75% quieter motor 3LB extra-large capacity Blue Marble NATIONAL GEOGRAPHIC Rock Tumbling Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, an Educational STEM Science Kit

**Brand:** blue marble
**Price:** 1547 Lei
**Availability:** ✅ In Stock

## Summary

> 💎 Turn Rough Rocks into Coveted Gems — Because Your Desk Deserves a Story

## Quick Answers

- **What is this?** Blue Marble NATIONAL GEOGRAPHIC Rock Tumbling Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, an Educational STEM Science Kit by blue marble
- **How much does it cost?** 1547 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/294396871-blue-marble-national-geographic-rock-tumbling-kit-3lb-extra-large)

## 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:** Exclusive reusable GemFoam technology delivers a brilliant, museum-quality polish every time.
- • **Set It & Forget It:** Automatic shutoff timer with customizable speed and time controls for effortless precision.
- • **Whisper-Quiet Power:** Advanced motor and leak-proof stainless steel barrel reduce noise by 75%, perfect for home or office.
- • **Wear Your Masterpiece:** Comes with 5 jewelry fastenings—necklace, ring, keychain, and clip-on earrings—to flaunt your creations.
- • **All-Inclusive Gem Creation:** Includes 3 lbs of rough stones featuring 9 unique gemstones plus 4 polishing grits for professional results.

## Overview

The Blue Marble NATIONAL GEOGRAPHIC Rock Tumbling Kit is a premium 3LB capacity STEM science kit designed for ages 8 and up. Featuring a durable, whisper-quiet motor with adjustable speed and timer, it includes 3 pounds of diverse rough gemstones, four polishing grits, and innovative reusable GemFoam for an unparalleled shine. Complete with jewelry fastenings, this kit transforms raw stones into polished gems ready to wear or display, making it the ultimate hands-on educational experience for aspiring geologists and creative professionals alike.

## Description

NATIONAL GEOGRAPHIC Rock Tumbling Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, an Educational STEM Science Kit

## Features

- CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This professional rock polisher 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 polishing 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!
- 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 |
|---------------|-------|
| Product Dimensions | 32.4 x 26.2 x 17 cm; 3.7 kg |
| Manufacturer recommended age | 8 years and up |
| Item model number | NGTUMBLER3LB |
| Educational Objective(s) | STEM, Concept Development Skills, Hand-Eye Coordination, Critical Thinking, Reasoning Exploratory Skills |
| Language: | English |
| Assembly Required | No |
| Batteries Required? | Yes |
| Batteries Included? | No |
| Material Type(s) | default_no_selection_value |
| Remote Control Included? | No |
| Remote Control Type | None - Not Applicable |
| Color | Multicolor |
| ASIN | B08DL95CWL |

## Product Details

- **Size:** L
- **Brand:** Blue Marble
- **Theme:** Science
- **Age range (description):** Kid,Adult
- **Item dimensions L x W x H:** 32.4 x 26.2 x 17 centimeters

## Images

![Blue Marble NATIONAL GEOGRAPHIC Rock Tumbling Kit - 3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, an Educational STEM Science Kit - Image 1](https://m.media-amazon.com/images/I/91ThOdjpWqL.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.

## 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 Romania*
*Store origin: RO*
*Last updated: 2026-01-26*