---
product_id: 34394992
title: "National Geographic Starter Rock Tumbler Kit for Kids and Adults"
brand: "blue marble"
price: "€ 179.17"
currency: EUR
in_stock: true
reviews_count: 13
category: "Blue Marble"
url: https://www.desertcart.hr/products/34394992-national-geographic-starter-rock-tumbler-kit-for-kids-and-adults
store_origin: HR
region: Croatia
---

# ½ lb rough gemstones 4-stage polishing grit leak-proof, rubber-lined barrel National Geographic Starter Rock Tumbler Kit for Kids and Adults

**Brand:** blue marble
**Price:** € 179.17
**Availability:** ✅ In Stock

## Summary

> 💎 Polish your passion, rock your world!

## Quick Answers

- **What is this?** National Geographic Starter Rock Tumbler Kit for Kids and Adults by blue marble
- **How much does it cost?** € 179.17 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/34394992-national-geographic-starter-rock-tumbler-kit-for-kids-and-adults)

## 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

- • **Complete All-in-One Kit:** Includes ½ lb of diverse gemstones, polishing grit & jewelry fastenings.
- • **Award-Winning Quality & Support:** Backed by Toy of the Year winner and US-based customer care.
- • **Whisper-Quiet, Spill-Proof Design:** Rubber-lined barrel ensures silent, mess-free tumbling.
- • **Step-by-Step STEM Learning Experience:** Detailed guides make geology fun and educational for all ages.
- • **Transform Rough Rocks into Sparkling Gems:** Turn raw stones into polished treasures with ease.

## Overview

The National Geographic Starter Rock Tumbler Kit is a durable, leak-proof rock polishing system designed for kids and adults. It includes ½ pound of rough gemstones, a rubber-lined barrel for quiet operation, a four-stage polishing grit process, and jewelry fastenings to create wearable treasures. This award-winning STEM kit offers an educational, hands-on geology experience with detailed instructions and a full-color learning guide, making it perfect for hobbyists eager to transform raw stones into sparkling gems.

## Description

desertcart.com: National Geographic Starter Rock Tumbler Kit for Kids and Adults | Leak-Proof Rubber Barrel, 1/2 Lb. Rough Gemstones, 4-Stage Polishing Grit, Jewelry Fastenings, Geology Hobby, Birthday Gift : Toys & Games

Review: Great but hard to close - This is a great product, however it is extremely hard to open and close the cylinder. My grandson could not open or close, nor could I. Actually, there war two men who could not get it closed. We had to ask someone who was much stronger and he struggled…. But it does a great job once you get it closed. I took it to my mechanic and had him open it for me the last two times….lol Probably just look at the draw.
Review: Everything you need - Just got my hands on the national geographic starter rock tumbler kit and I'm absolutely stoked! this thing is a beast, turns rocks into sparkly crystals like a pro (or, like, a kid, lol). it's a bit loud, but hey, it's worth it - just toss it in the garage and let it do its magic. what i love most is that it comes with everything you need to get started - no extra purchases necessary! the leak-proof design is a total win, too. all in all, this thing is a solid 5 stars - perfect for the little geologists out there (or, you know, the slightly-bigger geologists like me)!

## Features

- CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This starter 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 allows you to tumble multiple batches of rocks. An improved, leak-proof barrel is lined with rubber for quieter operation while tumbling on the sturdy tumbler base.
- ALL-IN-ONE TUMBLING KIT - This kit has everything you need and then some! You get ½ a pound of rough rocks with nine different types of gemstones inside, five jewelry fastenings, and our four-stage rock polishing grit.
- EASY TO USE AND EDUCATIONAL - Detailed tumbler instructions lead you step-by-step through the rock tumbling process, A full-color learning guide details how rocks are naturally polished and has fascinating facts about the gemstones in the kit.
- 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 | B01I56RV0C |
| Additional Features | Spill-Proof |
| Age Range (Description) | 8 years and up |
| Age Range Description | 8 years and up |
| Art Craft Kit Type | Rock Polishing |
| Best Sellers Rank | #10,710 in Toys & Games ( See Top 100 in Toys & Games ) #7 in Kids' Rock Tumblers |
| Brand | Blue Marble |
| Brand Name | Blue Marble |
| Color | Multicolor |
| Customer Reviews | 4.3 out of 5 stars 11,130 Reviews |
| Global Trade Identification Number | 00816448020391 |
| Included Components | 5 Jewelry Fastenings, Four Levels of Grit, Leak-proof, Rubber-lined Tumbler Barrel, Rock Tumbler, ½ Pound of Stones |
| Item Dimensions | 10.98 x 5.2 x 12 inches |
| Item Type Name | Complete Rock Tumbling Kit - Geology Hobby Science Kit, Rocks and Crystals for Kids, A Great STEM Activity |
| Item Weight | 1.9 kg |
| Item dimensions L x W x H | 10.98 x 5.2 x 12 inches |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer Part Number | NGTUMBLER2 |
| Material | Rubber |
| Material Type | Rubber |
| Model Name | Complete Rock Tumbling Hobby Kit |
| Model Number | NGTUMBLER2 |
| Number of Pieces | 30 |
| Product Style | Modern |
| Seasons | All Seasons |
| Set Name | Necklace, Key chain, Ring, Two clip-on earring fastenings |
| Size | 1 Count (Pack of 1) |
| Subject Character | Rock Tumbling, Gemstones |
| Theme | Geology |
| UPC | 816448020391 |
| Unit Count | 1 Count |
| Warranty Description | We're proud to make the highest quality products which are backed by exceptional service. |

## Product Details

- **Age Range (Description):** 8 years and up
- **Brand:** Blue Marble
- **Color:** Multicolor
- **Item dimensions L x W x H:** 10.98 x 5.2 x 12 inches
- **Theme:** Geology

## Images

![National Geographic Starter Rock Tumbler Kit for Kids and Adults - Image 1](https://m.media-amazon.com/images/I/91kh7806KEL.jpg)
![National Geographic Starter Rock Tumbler Kit for Kids and Adults - Image 2](https://m.media-amazon.com/images/I/81uETIiFyJL.jpg)
![National Geographic Starter Rock Tumbler Kit for Kids and Adults - Image 3](https://m.media-amazon.com/images/I/815wWK0xLuL.jpg)
![National Geographic Starter Rock Tumbler Kit for Kids and Adults - Image 4](https://m.media-amazon.com/images/I/81rYGipUvoL.jpg)
![National Geographic Starter Rock Tumbler Kit for Kids and Adults - Image 5](https://m.media-amazon.com/images/I/81-E+OZqAVL.jpg)

## Questions & Answers

**Q: Can this be used to tumble glass to make sea glass?**
A: Yes! I have a spot where I find lots of shards of glass and rare colors but they just aren’t “cooked” enough. I got the tumbler to finish them. The glass I have is real sea glass not fake nor bottles I break (which I have never done and won’t because I like that I find my glass and know it has a story from whence it came!) I have found it along beaches and rivers but it just needed some extra time to be perfect but because of the color rarity I wasn’t going to toss it back!

**Q: Where can I buy more grit?**
A: Amazon (there are alternatives if you want to search for a specific one you need: coarse (60/90 grit), medium (150/220 grit), fine (500 grit), rock polish (TXP aluminum oxide) but below are two choices that will contain all you’d need, are approx the same lbs of material, and will work equally well):

https://www.amazon.com/dp/B01MRKI4W0/ref=cm_sw_r_cp_api_i_8luBDbAX0440H

https://www.amazon.com/dp/B07PYFGT44/ref=cm_sw_r_cp_api_i_SkuBDbZFZBTVW

**Q: How many pounds/ounces of rocks can you put into the barrel with grit for tumbling?**
A: The Rock Tumbler can hold 1lb (16oz) of rocks in the barrel with the grit for tumbling.Thank you for your inquiry!

**Q: How long does it take from start to finish? And can you use any rocks or only the ones that come with it**
A: Each grade of sand is a different grit. About 3 weeks and one extra week to polish. You can run any rocks even ones that you find.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great but hard to close
*by B***B on February 23, 2026*

This is a great product, however it is extremely hard to open and close the cylinder. My grandson could not open or close, nor could I. Actually, there war two men who could not get it closed. We had to ask someone who was much stronger and he struggled…. But it does a great job once you get it closed. I took it to my mechanic and had him open it for me the last two times….lol Probably just look at the draw.

### ⭐⭐⭐⭐⭐ Everything you need
*by T***D on January 3, 2025*

Just got my hands on the national geographic starter rock tumbler kit and I'm absolutely stoked! this thing is a beast, turns rocks into sparkly crystals like a pro (or, like, a kid, lol). it's a bit loud, but hey, it's worth it - just toss it in the garage and let it do its magic. what i love most is that it comes with everything you need to get started - no extra purchases necessary! the leak-proof design is a total win, too. all in all, this thing is a solid 5 stars - perfect for the little geologists out there (or, you know, the slightly-bigger geologists like me)!

### ⭐⭐⭐⭐ Really fun and great for kids of all ages!
*by M***L on July 4, 2023*

My second grade students became interested in rock tumbling this year after another student brought in their collection. Soon they started collecting rocks on the playground. I knew I had to capitalize on their excitement, so I found this kid friendly rock tumbler. First things first, it is AMAZING. It comes with everything you need, including cool rocks ready to tumble, although you’ll probably need to restock the grinding powders if you’re going to do multiple sets like we have. A few things to note: It is hard to open and close. Have someone strong on hand to do it, because I struggle to do it myself. It is LOUD. I mean, it’s rocks tumbling in a jar. Of course it’s loud. But find someplace to set it up near a plug because it’s going to be distracting otherwise. In the classroom, we stuffed it in a cabinet - still made noise but muffled it enough that we could still focus. At home, we did it on the back porch. I’m sure the neighbors could hear it on quiet nights, but oh well. As long as you muffle it, it’ll sound like a white noise. Last but not least, this process takes a lot of TIME! About a month from start to finish. Be patient. The good news is that aside from opening it, filling it, and plugging it in, there’s minimal upkeep. You just leave it alone and let the tumbler do its job. Opening it every week was the highlight of our week. The process is so cool even after just the first cycle. It’s so worth the time it takes. Don’t drain it in your sinks. The gunk will mess up your pipes. After the last cycle, the rocks won’t be fully polished. We bought some mineral oil and polished them ourselves for a nice sheen. Worth the additional extra few bucks. After school let out, I brought it home to do it again with my toddlers. They loved it just as much as the big kids. I would recommend this to any future geologist in the making!

## Frequently Bought Together

- NATIONAL GEOGRAPHIC Starter Rock Tumbling Kit - Durable Leak-Proof Polisher for Kids Complete Geology Hobby Science Kit, Rocks and Crystals Kids, A Great STEM Activity
- 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
- 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 Croatia*
*Store origin: HR*
*Last updated: 2026-07-29*