• 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.
• START A TUMBLING JOURNEY -- 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.
• 2.5LB LARGE CAPACITY & 75% QUIETER -- 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. A complete polishing cycle usually takes 3–4 weeks, during which stones gradually become smoother and slightly smaller.
• 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).
• 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.

Product information

Brand Name: KoolStone
Age Range Description: Suitable for children aged 13 and above
Manufacturer Maximum Age (MONTHS): 1188.0
Manufacturer Minimum Age (MONTHS): 156.0
Set Name: C1 Rock Tumbler Kit
Manufacturer: KoolStone
Manufacturer Part Number: KS20220422
Model Number: KS20220422
Unit Count: 1 Count
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
Item Type Name: Rock Tumbler

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 Amazon 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!