Dan&Darci Advanced Professional Rock Tumbler Kit - with Digital 9-Day Polishing Timer & 3 Speed Settings - Turn Rough Rocks into Beautiful Gems : Great Science & STEM Geology Toy for Kids All Ages
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Extended holiday returns
Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Friday, Dec 19
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Features
- Turn rough rocks into polished gems: Discover and learn the fun process of rock tumbling with the Advanced Rock Tumbler. Pour in the rough stones and grit and let the machine do its job!
- Complete kit: Includes: rock tumbler machine, low-noise barrel (1 lb. capacity), 4 grit packets, 1/2 lb. assorted rough rocks, mesh strainer, jewelry fasteners, gem storage bag, and an illustrated easy-to-follow instruction and learning guide booklet.
- Powerful quality: Runs on a powerful heavy duty motor that will last for a very long time, and includes a leak-resistant barrel that runs quieter than the other brands.
- Advanced features: Includes speed controls (providing more granular tumbling results), a 9-day timer (shuts off automatically when you desire), all displayed on beautiful LCD screens.
- A fun and educational gift for all ages: It's not often that a science project can be fun and engaging, but this kit achieves both! It fascinates children and adults as soon as they pull it out of the box and is a perfect STEM project for any age. It fosters a love for science, geology and mineralogy in a fun and exciting way.
Product Dimensions: 12.7 x 10 x 5.7 inches
Item Weight: 5.97 pounds
Item model number: Rock Tumbler
Manufacturer recommended age: 8 years and up
Is Discontinued By Manufacturer: No
Manufacturer: Dan&Darci
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Dec 19
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
So far we are on step 2 of our first set of rocks tumbling. It’s working great and my daughter loves that it has a digital display on how many days are left that she can check each day.
Reviewed in the United States on August 20, 2025 by Dawn Newman
I often collect rocks wherever I go, I have for years, and I’ve wanted to get a rock tumbler for some time. When my daughter expressed interest finally getting one was an instant no-brainer. I liked the look of the Dan&Darci machine; it looked solid and stable, it was professional looking. I liked that it had multiple speeds and a multi-day timer. As soon as we got it my daughter couldn’t wait to get started. The machine was as solid and sturdy as it appeared and the instructions were very clear and easy to follow. We put in the rocks, grit, and water, sealed the barrel and turned it on. It made much less noise than expected. We’ve had this running for a while; no issues, no leaks, no problems … many jealous friends and family members...
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Reviewed in the United States on April 12, 2019 by Andrew Eisenberg
The tumbler works well enough, it's very reasonably priced, and generally a good kit. The rocks that come with it are a good starter; there are some findings included for finished rocks; and the instructions are reasonably good (accepting some significant caveats below). There's also an included strainer, but we found it much too small, and just used a small colander from our kitchen. Accepting the good points, there are a few important things to consider: 1) The kit comes with a paltry amount of grit. We followed the instructions to the letter using the small grit packets provided in the box, and just couldn't get a good polish on the included rocks. However, we had also bought a set of additional grit at the same time, so we re-ran exactly the same rocks with proper amounts of grit and got a beautiful polish. The additional grit was exactly the same grade and composition as the original, but its instructions called for 2-3x more grit per run. So, I expect a lot of people will be underwhelmed at the polish they get, not realizing that the minimal amount of grit is likely the problem. Since grit is a consumable that you'll need more of anyway, you can save yourself a wasted month of tumbling by buying more grit and just topping off what comes with the kit (2 tbsp for stages 1 and 2, and 1 tbsp for stages 3 and 4). 2) The tumbler runs fast, even at its slowest speed (seems at least twice as fast as the tumblers I'm familiar with). This means it's on the louder end (we kept it in the garage) and it doesn't seem to do a good job on more angular or larger rocks, because the tumbling action is just too aggressive. Anything under 3/4" diameter and/or mostly round will polish up great—which mostly included the rocks that came with our set—but anything outside that ended up with some unpolished edges (although the smooth/flat parts still polished up well). That stated, you can cheat and use mineral oil to mostly hide the rough edges, but they still won't look as good as they do with a proper polish. (Although, I haven't yet tested if ceramic media or poly pellets could improve this situation by cushioning the rocks during the final polish stage.) 3) The instructions could be better with respect to cleaning, and don't cover burnishing at all. For cleaning between stages, after a thorough rinse I strongly recommend putting the rocks back in the tumbler with warm water and a drop or two of dish soap, and then just running it for an hour on its lowest speed. This will clean out all of the grit from the last stage. Then just re-rinse (the sink is fine in this case, since there's so little grit) and start the next tumbling stage. You may want to burnish as a final step, to get a better shine. There are a number of good guides available, so I suggest just searching for the term "rock burnishing".
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Reviewed in the United States on March 13, 2022 by Justin
So far so good, but customer service is lacking so keep that in mind. I emailed weeks ago and never got a response to a question. When the tumbler shuts off it is still on day 1, so I wasn't sure if it was supposed to be that way. I thought it had stalled, so I ran it another day. Later on, I ran a second load of agates in it, and it did the same thing, so I can only assume it is supposed to do that. I've only ran it twice, but I'm loving the results. I didn't use the grit they provided. I use polly grit, and I'm getting awesome results. I will use their grit one day to see what it does. I do lapidary work, so I was doing things different. Either grit you use, I recommend going to step 3, just like other reviews said. Here's something to try. Use grit 3 fine pre polish, a tablespoon, along with half a tablespoon of #1 coarse. Run it for 3 Days on speed 3. Then run it with the same contents for another day on speed 1. Rinse everything. Reload and add in grit 4, tablespoon, with half a tablespoon of cerium oxide. Run the grit 4 and cerium for 2 days on speed 1. I had very good shine and rounded edges. But keep in mind, this process is for agates. For softer stones, you'll want to slow your speed and maybe drop a day. If this thing keeps working, or at least a good while, I would definitely invest in it again. My only regret is that I didn't buy their larger tumbler.
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Reviewed in the United States on November 26, 2025 by kytrailhikers kytrailhikers
While this item is not a toy, and is actually a nice way to step into the world of rock and gemstone collecting without a huge investment, I purchased it for my kids. Due to school shut-downs the easter bunny this year brought science items. This was one of them. The tumbler does just that, it tumbles or rolls the rocks, which makes it a bit loud, but still managable. The stones are nice quality and the kids should have fun trying to figure out what type they all are. There is a good variety of stones as well. The grit packets do what they are meant to do. Just read the booklet, add your stones grit and water. Close up the tumbler, set the timer and speed, and let it go. We are currently in stage two of our tumbling, but so far I am liking the product, more importantly so are the kids.
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Reviewed in the United States on April 18, 2020 by Kate
Had this for 1 year now and still works great. Alway fun seeing the results after the final stage.
Reviewed in the United States on October 24, 2025 by Dennis Batchelor