---
product_id: 442292850
title: "C1 Rock Tumbler Kit - Large 2.5LB Rotary Rock Tumbler for Adults & Hobbyists, Quiet Rubber Barrel, Adjustable Timer & Speed, Complete Gem Polishing Kit with Memory Function"
brand: "koolstone"
price: "3694055₫"
currency: VND
in_stock: true
reviews_count: 13
category: "Kool Stone"
url: https://www.desertcart.vn/products/442292850-c1-rock-tumbler-kit-large-2-5lb-rotary-rock-tumbler
store_origin: VN
region: Vietnam
---

# 75% quieter rubber barrel 9-day timer with memory 2.5LB large capacity C1 Rock Tumbler Kit - Large 2.5LB Rotary Rock Tumbler for Adults & Hobbyists, Quiet Rubber Barrel, Adjustable Timer & Speed, Complete Gem Polishing Kit with Memory Function

**Brand:** koolstone
**Price:** 3694055₫
**Availability:** ✅ In Stock

## Summary

> 💎 Turn Rough Rocks into Polished Perfection — Join the Elite Rock Tumbling Movement!

## Quick Answers

- **What is this?** C1 Rock Tumbler Kit - Large 2.5LB Rotary Rock Tumbler for Adults & Hobbyists, Quiet Rubber Barrel, Adjustable Timer & Speed, Complete Gem Polishing Kit with Memory Function by koolstone
- **How much does it cost?** 3694055₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/442292850-c1-rock-tumbler-kit-large-2-5lb-rotary-rock-tumbler)

## Best For

- koolstone enthusiasts

## Why This Product

- Trusted koolstone brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Batch More, Wait Less:** Generous 2.5LB barrel lets you polish more stones per cycle, maximizing your creative output.
- • **Whisper-Quiet Tumbling:** Rubber barrel reduces noise by 75%, perfect for home, classroom, or office without disruption.
- • **All-Inclusive Starter Kit:** Comes with 1LB assorted rough stones, 4 polishing grits, ceramic media, spare belts, jewelry fastenings, and a detailed guide—everything to launch your gem-polishing journey.
- • **Confidence in Every Cycle:** Backed by a 1-year warranty and 90-day risk-free trial, plus easy maintenance with replaceable drive belts for long-lasting use.
- • **Precision Control at Your Fingertips:** Adjustable 3-speed settings and a 9-day timer with auto shutoff and memory ensure flawless polishing every time.

## Overview

The KoolStone C1 Rock Tumbler is a professional-grade, beginner-friendly kit featuring a large 2.5LB rubber barrel that operates 75% quieter than typical models. It offers precise tumbling control with 3 adjustable speeds and a 9-day timer with memory and auto shutoff. This all-in-one kit includes assorted rough stones, polishing grits, ceramic media, spare belts, and jewelry fastenings, supported by a 1-year warranty and 90-day money-back guarantee—ideal for STEM enthusiasts and hobbyists eager to transform ordinary rocks into stunning polished gems.

## Description

Product description It's never too late to start a hobby! A New Way to Polish Transform ordinary rocks into dazzling gemstones — right at home. KoolStone Rock Tumbler makes it easy and exciting to turn rough stones into smooth, polished treasures. Whether you’re a curious beginner or a passionate collector, everything you need is included. This isn’t just a tumbler — it’s a journey through geology, patience, and reward. Just add rocks, grit, and water, then let the process unfold over a few weeks. The result? Stunning stones you’ll be proud to display, trade, or turn into custom jewelry. Welcome to Your Creative Journey with KoolStone! We’re amazed by the beautiful creations you craft with your rock tumbler! Share your stunning results with us, and we’ll showcase your work across our desertcart page and social media—your creativity deserves to shine. Pro Tip: For that perfect shine, pair your tumbler with our high-quality polishing grits kit (don’t forget to add it to your cart!). Combined with soap water, mineral oil, and patience, they’ll transform rough rocks into dazzling jewels for jewelry, crafts, or your collection. Have concerns? We’re here to help—quickly and cheerfully. Just reach out, and our team will ensure a seamless experience. Your satisfaction is our priority! Keep creating, keep inspiring, and let’s bring your vision to life—together. KoolStone – Where Imagination Meets Craftsmanship. ↓ Add KoolStone 4 LBS Polishing Grit Kit for long-term polishing needs—better value per use! FAQs About KoolStone Rock Tumblers 1. Can you put regular rocks in a rock tumbler? And Can the rock tumbler be used for sea glass? You will want to avoid soft rocks as they might just fall apart when you add them to a rock tumbler and some really hard rocks might damage your tumbler. And the rock tumbler can be used to polish sea glass effectively! 2. How long does it take to polish rocks in a rock tumbler? For beginners, the answer can come as a bit of a shock as it could be one week or one month to tumble rocks to a polish that you are happy with. Patience is a virtue in this hobby. The end result can be worth the wait as they look great when they are finished. 3. If my belts broken, how can I do? Belts might break after a long time use. No worries, please feel free to reach out us to get the replacement. 4.What other items can you tumble? If you’ve found some coins then you can throw those in the rock tumbler. A rock tumbler will help clean it giving it a nice shine. Other than coins you can also place shells inside a rock tumbler. IMPORTANT TIPS 1. Mind the Noise: Tumbling machines can be quite noisy. We recommended that you keep it in the garage so that you don't disturb your neighbors. 2. Don't wash grits down the drain! It will create a clog that is impervious to drain cleaner. Rinse the grits steps outside using a garden hose. 3. Use mineral oil for extra shine! If you want your finished stones to be really shiny, coat and polish the stones with mineral oil. 4. Notice: If any part is missing, please take a moment to reach out to us for a replacement or compensation. Thank you for your patience and understanding!

Review: Great small rock tumbler…. - Great product. Works well, tumbles relatively quietly in the rubber drum. Easy to load/unload rocks for the various stages. Easy to set up the duration in days and speed required. Excellent instruction manual. Would recommend to buy for anyone interested in seeing the beauty hidden away in some fairly common rocks..
Review: Great value for people who constantly tumble rocks. - Product works well. Arrived with extra belts, some stones, grit, and ceramic. Customer service A+. MOTOR died two weeks into tumbling; I contacted customer support and messaged with Daisy. She sent out a replacement motor which I received within a week. Also sent out a screw driver and extra screws, and emailed a link to a video to show how to take out the old motor and replace it. Replacement was easy. Machine is up and tumbling again! Barrel size is larger than my other tumbling barrels. Noise level isn't quiet, but it isn't outrageous either. It is compact, light weight, and for the money, it is an excellent product. The bonus is the customer service.

## Features

- Turn Ordinary Rocks Into Beautiful Polished Gemstones At Home – C1 Rock Tumbler turn rough rocks into polished gems, then you will be very excited to see the stones change with each cycle. That's a fun process of rock tumbling and a family little project for parent-child endeavor.
- Large 2.5LB Capacity With Up To 75% Noise Reduction – The updated KoolStone Rock Tumbler features a large 2.5LB barrel, perfect for polishing multiple stones in one batch. Holds more rocks than most beginner tumblers. The rubber barrel is 75% quieter than typical plastic barrels, making it ideal for home or classroom use.
- Faster Polishing Time & Better Polishing Results – 3-speed controls (providing more granular tumbling results), a 9-day timer (with automatic shutoff feature and memory function), all displayed on clear screen, letting you easily hone your settings for precise tumbling each time.
- Everything You Need For Tumbling Is Here – C1 Rock Tumbler has everything you need to create polished gemstones. Rock tumbler, 2.5LB capacity rubber barrel, 1LB for 9 different types of rough gemstones, 3 belts and 4 polishing grits and ceramic contact media, sifter, jewelry fastenings, and illustrated tutorial guide. For longer use and better results, pair it with KoolStone’s 4LB Professional Polishing Grit (sold separately).
- KoolStone C1 Series – Trusted by Beginners, Backed by Experts. Start your rock tumbling journey with KoolStone, the brand trusted by thousands of families and hobbyists. The C1 Rock Tumbler is a classic model that balances reliable performance with all-in-one convenience. From the classic C1 to the Pro, Pro Max, and Pro Ultra, KoolStone continues to evolve with exclusive designs and upgraded performance for every rock enthusiast — ready to start your rock tumbling journey.
- Official KoolStone Warranty – 𝟏 𝐘𝐞𝐚𝐫 𝐂𝐨𝐯𝐞𝐫𝐚𝐠𝐞 & 𝟗𝟎-𝐃𝐚𝐲 𝐑𝐢𝐬𝐤-𝐅𝐫𝐞𝐞 𝐓𝐫𝐢𝐚𝐥. Your purchase is protected by KoolStone’s official 𝟏-𝐲𝐞𝐚𝐫 𝐰𝐚𝐫𝐫𝐚𝐧𝐭𝐲 and a 𝟗𝟎-𝐝𝐚𝐲 𝐦𝐨𝐧𝐞𝐲-𝐛𝐚𝐜𝐤 𝐠𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞. Shop with confidence — we’re here to support your tumbling journey.
- Easy Maintenance – The durable drive belt is designed to be replaceable, making maintenance simple and extending the life of your rock tumbler.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09YM33DGD |
| Age Range Description | Suitable for children aged 13 and above |
| Best Sellers Rank | #18,078 in Toys & Games ( See Top 100 in Toys & Games ) #7 in Kids' Rock Tumblers |
| Brand Name | KoolStone |
| Color | Brush Edition: C1 |
| Customer Reviews | 4.4 out of 5 stars 2,851 Reviews |
| Educational Objective | STEM |
| Included Components | 1-Year Warranty Card, Illustrated Learning Booklet, 1A Power Adapter, Jewelry Fastenings, Mesh Strainer, Screwdriver, 1LB Assorted Rough Rocks, 3 Belts for Spare Use, 4 Bags of Polishing Grits, 1 Bottle Ceramic Tumbling Media, Rock Tumbler Base, 2.5LB Capacity Rubber Barrel |
| Indoor Outdoor Usage | Indoor |
| Is Assembly Required | No |
| Item Dimensions | 11.22 x 9.02 x 5.71 inches |
| Item Type Name | Rock Tumbler |
| Item Weight | 2.84 Kilograms |
| Manufacturer | KoolStone |
| Manufacturer Maximum Age (MONTHS) | 1188.0 |
| Manufacturer Minimum Age (MONTHS) | 156.0 |
| Manufacturer Part Number | KS20220422 |
| Material Type | 1.）Tyre grade rubber barrel and top-quality stainless steel. 2.) If you received the package and missing parts or damaged, no worries, please feel free to reach out at: support@ikoolstone.com to take the replacement. 3.) Any problems before purchasing, please reach out at: support@ikoolstone.com to get the answer. |
| Model Number | KS20220422 |
| Number of Batteries | 1 AA batteries required. |
| Number of Players | 1 |
| Operation Mode | Manual |
| Power Source | AC Adapter |
| Set Name | C1 Rock Tumbler Kit |
| Size | Large |
| Supported Battery Types | No batteries required |
| Theme | Perfect gift for rock lovers and hobbyists to create stunning polished stones. |
| Unit Count | 1.0 Count |

## Images

![C1 Rock Tumbler Kit - Large 2.5LB Rotary Rock Tumbler for Adults & Hobbyists, Quiet Rubber Barrel, Adjustable Timer & Speed, Complete Gem Polishing Kit with Memory Function - Image 1](https://m.media-amazon.com/images/I/81zDGxdlUJL.jpg)
![C1 Rock Tumbler Kit - Large 2.5LB Rotary Rock Tumbler for Adults & Hobbyists, Quiet Rubber Barrel, Adjustable Timer & Speed, Complete Gem Polishing Kit with Memory Function - Image 2](https://m.media-amazon.com/images/I/71nSbbQeMuL.jpg)
![C1 Rock Tumbler Kit - Large 2.5LB Rotary Rock Tumbler for Adults & Hobbyists, Quiet Rubber Barrel, Adjustable Timer & Speed, Complete Gem Polishing Kit with Memory Function - Image 3](https://m.media-amazon.com/images/I/81qvWbMYLSL.jpg)
![C1 Rock Tumbler Kit - Large 2.5LB Rotary Rock Tumbler for Adults & Hobbyists, Quiet Rubber Barrel, Adjustable Timer & Speed, Complete Gem Polishing Kit with Memory Function - Image 4](https://m.media-amazon.com/images/I/71wu4+2WgaL.jpg)
![C1 Rock Tumbler Kit - Large 2.5LB Rotary Rock Tumbler for Adults & Hobbyists, Quiet Rubber Barrel, Adjustable Timer & Speed, Complete Gem Polishing Kit with Memory Function - Image 5](https://m.media-amazon.com/images/I/71b1F6MZi1L.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great small rock tumbler….
*by A***S on March 30, 2026*

Great product. Works well, tumbles relatively quietly in the rubber drum. Easy to load/unload rocks for the various stages. Easy to set up the duration in days and speed required. Excellent instruction manual. Would recommend to buy for anyone interested in seeing the beauty hidden away in some fairly common rocks..

### ⭐⭐⭐⭐⭐ Great value for people who constantly tumble rocks.
*by M***R on January 26, 2026*

Product works well. Arrived with extra belts, some stones, grit, and ceramic. Customer service A+. MOTOR died two weeks into tumbling; I contacted customer support and messaged with Daisy. She sent out a replacement motor which I received within a week. Also sent out a screw driver and extra screws, and emailed a link to a video to show how to take out the old motor and replace it. Replacement was easy. Machine is up and tumbling again! Barrel size is larger than my other tumbling barrels. Noise level isn't quiet, but it isn't outrageous either. It is compact, light weight, and for the money, it is an excellent product. The bonus is the customer service.

### ⭐⭐⭐⭐⭐ Great for a First Time Tumbler
*by G***H on March 7, 2026*

For a first time rock tumbler this is great! Super easy to use- the instructions are clear & simple to follow. The machine is easy to use & pretty quiet for what it is, but I also have nothing to compare it with. It's small enough I'd take it camping with me as long as I've got an electric site. I've just started the second phase & the first phase worked well!

## Frequently Bought Together

- KoolStone C1 Rock Tumbler Kit - Professional Large 2.5LB Capacity, Up to 5X More Noise Cancelling, Adjustable Timer & Speed with Full Accessories & Memory Function, Ideal for Adults 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
- 5 Packs of Rock Tumbler Replacement Belts, Only Compatible with KoolStone C1, C1 Pro & C3 Rock Tumbler, 78 * 4mm

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-06-04*