---
product_id: 442292850
title: "C1 Rock Tumbler Kit - 2.5LB Rotary Rock Tumbler for Adults & Beginner Hobbyists, Quiet Rubber Barrel, Adjustable Timer & 3 Speeds, Complete Gem Polishing Kit with Memory Function"
brand: "koolstone"
price: "€ 250.31"
currency: EUR
in_stock: true
category: "Kool Stone"
url: https://www.desertcart.hr/products/442292850-c1-rock-tumbler-kit-2-5lb-rotary-rock-tumbler-adults
store_origin: HR
region: Croatia
---

# 75% quieter tumbling noise 9-day adjustable digital timer 2.5 lb capacity rubber barrel C1 Rock Tumbler Kit - 2.5LB Rotary Rock Tumbler for Adults & Beginner Hobbyists, Quiet Rubber Barrel, Adjustable Timer & 3 Speeds, Complete Gem Polishing Kit with Memory Function

**Brand:** koolstone
**Price:** € 250.31
**Availability:** ✅ In Stock

## Summary

> 💎 Turn Rough Rocks into Polished Masterpieces — Your Next-Level Hobby Starts Here!

## Quick Answers

- **What is this?** C1 Rock Tumbler Kit - 2.5LB Rotary Rock Tumbler for Adults & Beginner Hobbyists, Quiet Rubber Barrel, Adjustable Timer & 3 Speeds, Complete Gem Polishing Kit with Memory Function by koolstone
- **How much does it cost?** € 250.31 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/442292850-c1-rock-tumbler-kit-2-5lb-rotary-rock-tumbler-adults)

## 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

- • **Trusted & Supported:** Join over 1 million KoolStone users backed by a 1-year warranty, 90-day risk-free trial, and responsive customer support.
- • **Complete Starter Kit:** Includes 1 lb rough stones, 4 polishing grits, ceramic media, jewelry findings, and step-by-step guide—everything to start polishing today.
- • **Smart Timer with Memory:** Customize your tumbling with a 9-day digital timer, pause/resume function, and memory recall after power interruptions.
- • **Polish More, Quieter & Larger:** Spacious 2.5 lb rubber barrel cushions stones and cuts noise by 75% for a premium, peaceful hobby experience.
- • **Designed for Adults & Beginners:** User-friendly controls and clear instructions make it perfect for professionals and hobbyists diving into gem crafting.

## Overview

The KoolStone C1 Rock Tumbler Kit is a professional-grade, quiet rotary tumbler with a large 2.5 lb rubber barrel, adjustable 9-day digital timer with memory, and 3 speed settings. Designed for adults and beginners, it includes a complete polishing kit with rough stones, grits, ceramic media, and jewelry findings. Trusted by over 1 million users, it offers a quieter, more efficient tumbling experience backed by a 1-year warranty and expert support.

## Description

desertcart.com: KoolStone C1 Rock Tumbler Kit - 2.5LB Rotary Rock Tumbler for Adults & Beginner Hobbyists, Quiet Rubber Barrel, Adjustable Timer & 3 Speeds, Complete Gem Polishing Kit with Memory Function : Toys & Games

## Features

- Designed for Adults and Beginner Hobbyists – Turn rough rocks into polished gemstones with an easy-to-follow home tumbling system. The complete kit, simple controls and step-by-step guide make it easier to start your first batch while still offering enough capacity for an ongoing rock-polishing hobby.
- Large 2.5 lb Capacity with a Quieter Rubber Barrel – Polish more stones in each batch with a spacious 2.5 lb barrel—a practical step up from smaller 1 lb starter tumblers. Its thick rubber construction helps cushion rock impact and produces up to 75% less noise than typical plastic barrels for a more comfortable tumbling experience in garages, workshops and hobby spaces.
- Smart Controls with Pause, Resume and Memory – Choose from 3 speed settings and program each polishing stage with the clear 9-day digital timer. Pause the tumbler to check your rocks, then resume the batch without starting over. Automatic shutoff stops operation when the selected time ends, while the memory function restores your previous settings after a power interruption.
- Complete Kit for Your First Tumbling Batch – Includes a 2.5 lb rubber barrel, 1 lb of rough gemstones in 9 varieties, 4 polishing grits, ceramic tumbling media, a mesh strainer, jewelry findings, an illustrated step-by-step guide and 3 drive belts. The essential supplies for completing your first polishing journey and turning finished gems into keepsakes are included.
- Clear Guidance from Rough Rocks to Polished Gems – Follow the illustrated guide through each stage of the tumbling process. Each stage generally takes several days, and full results may take a few weeks depending on the rock type, size and desired shine. The tumbler is suitable for agate, jasper, quartz, aventurine, tiger’s eye，sea glass and similar hard stones.
- Replacement Belts and Responsive Customer Support – Three included drive belts help keep future tumbling batches moving, while replaceable components support continued use over time. The KoolStone support team is available to help with setup, operation, troubleshooting and replacement-part questions as you build experience with the hobby.
- Over 1,000,000 KoolStone Rock Tumblers Sold In The U.S. – Trusted by families and hobbyists across the country, KoolStone has helped make rock tumbling more approachable and enjoyable. The C1 combines simple controls, practical capacity and complete supplies to help new users begin tumbling with confidence. Based on internal KoolStone U.S. unit sales data through June 2026.
- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09YM33DGD |
| Age Range Description | Suitable for children aged 13 and above |
| Best Sellers Rank | #5,004 in Toys & Games ( See Top 100 in Toys & Games ) #2 in Kids' Rock Tumblers |
| Brand Name | KoolStone |
| Color | Brush Edition: C1 |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,446) |
| 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 |
| Item Dimensions | 11.22 x 9.02 x 5.71 inches |
| Item Type Name | Rock Tumbler |
| Item Weight | 2.84 kg |
| Manufacturer | KoolStone |
| Manufacturer Maximum Age (MONTHS) | 1188 |
| Manufacturer Minimum Age (MONTHS) | 156 |
| Manufacturer Part Number | KS20220422 |
| Manufacturer Warranty Description | 1 Year Warranty Against Manufacturer Defects |
| 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 Count |

## Images

![C1 Rock Tumbler Kit - 2.5LB Rotary Rock Tumbler for Adults & Beginner Hobbyists, Quiet Rubber Barrel, Adjustable Timer & 3 Speeds, Complete Gem Polishing Kit with Memory Function - Image 1](https://m.media-amazon.com/images/I/81hC+5nU+gL.jpg)
![C1 Rock Tumbler Kit - 2.5LB Rotary Rock Tumbler for Adults & Beginner Hobbyists, Quiet Rubber Barrel, Adjustable Timer & 3 Speeds, Complete Gem Polishing Kit with Memory Function - Image 2](https://m.media-amazon.com/images/I/719ZhKuS9ZL.jpg)
![C1 Rock Tumbler Kit - 2.5LB Rotary Rock Tumbler for Adults & Beginner Hobbyists, Quiet Rubber Barrel, Adjustable Timer & 3 Speeds, Complete Gem Polishing Kit with Memory Function - Image 3](https://m.media-amazon.com/images/I/81548QtXFLL.jpg)
![C1 Rock Tumbler Kit - 2.5LB Rotary Rock Tumbler for Adults & Beginner Hobbyists, Quiet Rubber Barrel, Adjustable Timer & 3 Speeds, Complete Gem Polishing Kit with Memory Function - Image 4](https://m.media-amazon.com/images/I/71hIwoV2KGL.jpg)
![C1 Rock Tumbler Kit - 2.5LB Rotary Rock Tumbler for Adults & Beginner Hobbyists, Quiet Rubber Barrel, Adjustable Timer & 3 Speeds, Complete Gem Polishing Kit with Memory Function - Image 5](https://m.media-amazon.com/images/I/81fqilTUvkL.jpg)

## Available Options

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

## 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 Croatia*
*Store origin: HR*
*Last updated: 2026-08-10*