---
product_id: 243528911
title: "NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Rock Polisher for Kids & Adults, Durable Noise-Reduced Barrel, Rocks, Grit & New GemFoam for a Shiny Finish, Cool Toys, Great STEM Hobby Kit"
brand: "blue marble"
price: "$195.92"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/243528911-national-geographic-hobby-rock-tumbler-kit-rock-polisher-for-kids
store_origin: US
region: United States of America
---

# GemFoam for ultimate shine 75% quieter leak-proof barrel Durable motor with timer NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Rock Polisher for Kids & Adults, Durable Noise-Reduced Barrel, Rocks, Grit & New GemFoam for a Shiny Finish, Cool Toys, Great STEM Hobby Kit

**Brand:** blue marble
**Price:** $195.92
**Availability:** ✅ In Stock

## Summary

> 💎 Polish your passion, rock your world!

## Quick Answers

- **What is this?** NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Rock Polisher for Kids & Adults, Durable Noise-Reduced Barrel, Rocks, Grit & New GemFoam for a Shiny Finish, Cool Toys, Great STEM Hobby Kit by blue marble
- **How much does it cost?** $195.92 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/243528911-national-geographic-hobby-rock-tumbler-kit-rock-polisher-for-kids)

## 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-Approved Fun:** Boost geology knowledge and creative thinking with a high-quality educational hobby kit for ages 8+.
- • **Complete All-in-One Kit:** Includes 9 gemstone types, 227g rough rocks, tumbler grit, jewelry fastenings, and a strainer—everything you need to start.
- • **Whisper-Quiet Operation:** Enjoy a noise-reduced barrel that’s 75% quieter than typical plastic models—perfect for home or office.
- • **Innovative GemFoam Polisher:** Add GemFoam in the final stage for a dazzling, museum-quality shine that stands out.
- • **Effortless Gemstone Creation:** Transform rough rocks into polished gems with simple, set-and-forget tumbling.

## Overview

The NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit is a durable, noise-reduced rock polisher designed for kids and adults. Featuring a powerful motor with timer control, a leak-proof stainless steel lid barrel that operates 75% quieter than plastic alternatives, and an innovative GemFoam polisher for a brilliant finish, this all-in-one STEM kit includes 227g of rough rocks, nine gemstone varieties, tumbler grit, jewelry fastenings, and a strainer. Ideal for creative learning and hands-on geology exploration.

## Description

NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Rock Polisher for Kids & Adults, Durable Noise-Reduced Barrel, Rocks, Grit & New GemFoam for a Shiny Finish, Cool Toys, Great STEM Hobby Kit

## Features

- CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This robust 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 tumbling time control settings so you can set it and forget it. The leak-proof barrel features a stainless-steel lid and is 75% quieter overall than plastic tumbler barrels.
- ALL-IN-ONE TUMBLING KIT - This kit has everything you need and then some! You get 227 grams of rough rocks with nine different types of gemstones inside, five jewelry fastenings, tumbler grit, a strainer, and our innovative new GemFoam rock polisher.
- 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!
- 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 | 33.3 x 12.7 x 20.7 cm; 1.9 kg |
| Manufacturer recommended age | 8 years and up |
| Item model number | NGHOBBYTUMBLER2 |
| Educational Objective(s) | Geology and Creative Thinking |
| Language: | English |
| Number of Game Players | 1 |
| Assembly Required | No |
| Batteries Required? | Yes |
| Batteries included? | No |
| tech_spec_battery_description_toys | Not required (mains powered) |
| Material Type(s) | default_no_selection_value |
| Material Composition | Multiple |
| Remote Control Included? | No |
| Colour | Multicolor |
| Release date | 21 Aug. 2020 |
| ASIN | B086Z6ZB7R |

## Product Details

- **Size:** 13.86 x 5.04 x 8.15 inches
- **Brand:** Blue Marble
- **Theme:** Geology
- **Age range (description):** 8 years and up
- **Item dimensions L x W x H:** 33.3 x 12.7 x 20.7 centimetres

## Images

![NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Rock Polisher for Kids & Adults, Durable Noise-Reduced Barrel, Rocks, Grit & New GemFoam for a Shiny Finish, Cool Toys, Great STEM Hobby Kit - Image 1](https://m.media-amazon.com/images/I/81540OkRB7L.jpg)

## Questions & Answers

**Q: What is the power consumption of this unit over a week of continuous use? (in usa on 110v). thank you.**
A: This takes .3 Amps, so (watts = amps x volts) OR watts = .3 x 110 which equals33 watts.  Now for one week would equal 33 watts x 7 days x 24 hours =5544 watts or 5.54 kilowatts for one week.At $.16 per kilowatt it comes to $.89 per week.

**Q: What the difference between this and the starter kit?**
A: There are two main differences:The Hobby Rock Tumbler has a rubber tumbling barrel with a stainless steel cap, which reduces noise and is more durable. The Starter Kit Rock Tumbler has a plastic barrel. The Hobby Rock Tumbler also has a keypad for setting the number of days you would like it to tumble, where as the Starter Kit Rock Tumbler's setting options are on/off. Thank you for your inquiry.

**Q: What pound tumbler is this product?**
A: Dearest National Geographic.... why would you only send 1# of rocks with a two pound tumbler?

**Q: Can i buy extra grit without the rocks. we have many rocks from "mining" gemstones that i would love to polish. what do you recommend?**
A: I recommend you follow the rock tumbler hobbiest MIchigan Rocks on Youtube. He's a good wealth of information for anyone getting into rock tumblers. He and other's mention that the polish from National Geographic is not good. I would go with rock tumbler polish offered by Polly Plastics.

## Frequently Bought Together

- NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit – Durable Leak-Proof Rock Polisher with 7-Day Timer – Complete Rock Tumbling Kit – Geology Hobby for Kids, Educational STEM Science Kit, Rock Collection
- 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 United States of America*
*Store origin: US*
*Last updated: 2026-03-15*