Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Create Stunning Gems Full Accessories Included
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Color: Black
Features
- DIVE INTO THE FUN ROCK TUMBLING: KomeStone rock tumbler is for turning rough raw rocks into smooth gemstones. Youll be excited to see the rocks change with each cyclea great lesson in patience for kids or inspiration for jewelry-making moms.
- 2025 NEW UPGRADE & ADVANCED FEATURES:Elevate your tumbling with a built-in LCD screen, 9-day timer, 3-speed controls, and pause/resume function. Features a thickened rubber barrel for durability and custom polishing recipes for brighter gems.
- 2.5 LB EXTRA LARGE CAPACITY & QUIETER: Our 100% soft rubber barrel absorbs impact, reducing noise by 75% (like a dishwasher). Polish 2.5x more rocks than 1 lb barrelsperfect for serious hobbyists.
- COMES WITH EVERYTHING YOU NEED: Includes: tumbler, barrel, 1lb rough rocks, 6 belts, 4 grits, ceramic media (as a gift in package), and a full-color guide so simple even a 4-year-old can use it independently.
- SCIENCE-BACKED POLISHING FOR PRO-LEVEL RESULTS: Achieve museum-quality shine with our 4-stage grit system (60/) and precision ceramic media. The leak-proof stainless steel lid ensures mess-free tumbling, while our exclusive guide unlocks pro techniques.
Product Dimensions: 11.22 x 9.02 x 5.71 inches
Item Weight: 6.2 pounds
Country of Origin: China
Item model number: K1
Manufacturer recommended age: 8 years and up
Is Discontinued By Manufacturer: No
Manufacturer: KomeStone
Frequently asked questions
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Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: Brushless Motor: K1 Pro
Alright, rock enthusiasts and aspiring geologists, gather 'round! I recently acquired the KomeStone K1 Pro Professional Cutting-Edge Rock Tumbler, hoping to transform my collection of backyard pebbles into sparkling treasures worthy of a museum (or at least, my mantelpiece). This machine is, indeed, cutting-edge... or at least, it cuts through the rough edges of rocks with impressive dedication. It's like a tiny, geological spa for your stones, giving them the smooth, polished glow they've always dreamed of. My rocks are now so shiny, I'm pretty sure they're starting to develop egos. The "professional" part? Well, it certainly sounds important, and it feels pretty robust. It hums along, doing its thing, turning mundane rocks into mini works of art. I've spent an embarrassing amount of time just watching it spin, mesmerized by the slow, steady transformation. It's surprisingly therapeutic, almost like a lava lamp, but with more potential for bling. My only minor quibble is that I now have an overwhelming urge to collect all the rocks. Every walk is an archaeological dig, every pebble a potential masterpiece. My pockets are perpetually full, and my family is starting to eye me suspiciously when I bring home yet another bag of "future gems." This tumbler is so effective, it's turning me into a rock hoarder. So, if you're looking to polish your pebbles (and perhaps your patience), the KomeStone K1 Pro is a solid investment. Just be warned: you might develop a serious case of "rock fever." It's a gem of a machine, and I'm totally rocking my new hobby!
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Reviewed in the United States on July 16, 2025 by KJo
Color: Brushless Motor: K1 Pro
I used to have a rock tumbler years ago and always enjoyed polishing up stones I found. Lately, I’d been thinking about getting back into it, and after reading the reviews for the K1 Pro Professional Cutting-Edge Brushless Motor Advanced Rock Tumbler Polisher Kit, I decided to give this one a try. I’m so glad I did! After just one tumbling cycle, I already had enough polished stones to start a small collection—and to use in craft projects, home decor, and even a few handmade gifts. The possibilities are endless, which makes the whole experience even more fun and rewarding. I’ve completed three cycles so far, and it’s fascinating to see how much the rocks transform. I usually start with stones of different shapes and sizes, and once I see how they turn out, I decide what to do with each one. If nothing specific comes to mind, I display them in a pretty crystal bowl—they’re beautiful all on their own. Compared to the tumbler I had years ago, this model is quieter, easier to use, and impressively well made. The brushless motor is strong, and the kit includes everything you need to get started. I have no complaints—it’s a solid, high-quality machine that makes an old hobby feel new again. I highly recommend it!
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Reviewed in the United States on June 26, 2025 by Barb
Color: Black
This is a very nice tumbler. Not like the flimsy toy ones. The barrel is made of thick rubber, not thin plastic and is very solid. I really like that it will hold 2 1/2 pounds of rock instead of the 1 pound for other tumblers. Setting the timer and speed is very easy. The rocks obviously make noise as they tumble but the motor itself is very quiet. The rocks that came with the kit are of high quality and there is just enough grit to do each step. The enclosed manual is simple to understand and very helpful. The package gives you the option to get additional belts for free. If you contact the company you will immediately hear from customer service. They seem very attentive. I received my free belts in a timely fashion and although I have not had any problems I am confident that their customer service will be there to help if I need them. I am very happy with my purchase.
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Reviewed in the United States on January 22, 2025 by Randy H.
Color: Black
This tumbler while well reviewed, well priced, and easy to use, may not be worth your time or money. Between my sister and I we have now owned 3 of them. By about the 6 month mark of use, all 3 abruptly quit working. They refuse to spin, even with an empty barrel, despite being well maintained. I would not recommend this tumbler. The company does not respond to messages or emails. The links on their website do not work. Their phone number is text only and also gets no response. There are other great tumblers out there that can be found for not much more money that will last for years. Amazon did try to help me connect with the company and when that did not work Amazon allowed me to return the product for a refund, even though it was well past the return window. EDIT: After posting this review and working with Shaving to return the tumbler, the company reached out to me. They told me that they had not recurved any of my communications Anna's ordered to send me a brand new tumbler even though I was able too get most off my money back from Amazon. They also reached out to my sister to take care of hers as well. They were very kind and polite to me. I just got the new tumbler last night. Here's hoping for better luck this round 😊
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Reviewed in the United States on August 13, 2024 by Johanna
Color: Black
Why did you choose this product over others? I’ve always been a rock hound and was looking for a fun, meaningful activity to share with my grandson. This tumbler stood out thanks to its reasonable price and strong customer reviews—it just seemed like the right balance of quality and value. Fun for kids: We had tried a different tumbler before, and unfortunately, it didn’t hold up. But this one has been fantastic. My 5-year-old grandson is so excited to tumble rocks—he checks the progress every day! It’s simple enough for us to use together, and it runs much quieter than I expected. Watching him get so engaged and curious has made it all the more worthwhile.
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Reviewed in the United States on July 3, 2025 by Slick