The Rock STEM Tumbler Kit

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Regular price $137.99 Save Liquid error (snippets/product-form line 69): Computation results in '-Infinity'%
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  • Rock tumbling is a hugely popular hobby for kids and adults! This professional rock tumbler makes it fun and easy to turn rough rocks into beautifully polished gemstones, thanks to its simple operation and durable design.
  • The durable motor has time and speed control settings so you can set it, and forget it. An improved, leak-proof barrel features a stainless-steel lid is 75% quieter overall than plastic tumbler barrels.
  • This kit has everything you need and then some! You get three pounds of rough rocks with nine different types of gemstones inside, five jewelry fastenings, grit, a strainer, and our innovative new GemFoam rock polisher.


This kit has all the features and accessories you’ll need to master rock tumbling, start an extraordinary rock collection, and create beautiful jewelry.
Contents and Features:

  • Automatic shutoff timer
  • Reliable, long-lasting motor
  • Leak-proof tumbler barrel
  • Noise reduced operation (75% quieter than plastic barrels)
  • Plenty of stones (3 lb) and four levels of grit
  • 5 Jewelry Fastenings
  • GemFoam, the most innovative way to add dazzling shine to your polished stones!

This high-quality tumbler allows you to set your speed and tumbling time. When the time expires, your tumbler will automatically shut-off, allowing you to choose the perfect amount of tumble time for each grit stage.


  • nProduct Dimensions 12.6 x 10.25 x 6.7 inches
  • Item Weight 10.5 pounds

Our SmartKidsPlanet initiative began in 2017 when 3 geeky and dedicated parents saw a gap in the children’s toys and games market. An opportunity was spotted while we struggled to find toys and games for our kids which enriched their minds and guided them toward science, art, math and construction. The trio then knew that their paths were set, establishing an online shop with a comprehensive range of intelligent toys for babies, children and young teenagers.

With offices based in California, our SmartKidsPlanet team enjoys a daily growth in our presence within the children’s educational toys market. We love our new place in life, and we love helping young minds with their growth and skill development, all while having as much fun as possible.


We ship all our products directly to you from our warehouses located in multiple locations in the West and East Coasts.

Processing Time: All orders placed after 2 PM EST will be shipped the next business day. Orders placed after 2 PM EST Friday will be shipped on Monday. 

Orders are shipped and generally arrive within 2 to 3 business days after the order is processed. Tracking information will be sent via email once your order has been processed. The tracking number may not become active for 24 - 48 hrs.

Kindly take note that due to our business utilizing multiple warehouses within the United States, orders of more than one item may arrive as separate deliveries at different times. 

Orders made to PO BOX may take up to 12 days. Additionally, we do not ship to military bases. Hawaii and Alaska

Customer Reviews

Based on 102 reviews
Fernando Bush
Rock solid machine (pun intended)

I have purchased many "hobby" rock polishers over the years (for me and my kids) They usually don't last more than a few cycles. This one seems solid! Easy to set up and use and very quiet... for a rock tumbler. This is the first one that has NOT been banished to the garage. Also, I can get replacement parts if needed. Great machine!!

Finnegan Erickson
Nice rubber based roller

It's nice that you can set a timer for each phase. The kit comes with lots of stones, but only one set of grits.

Kane Fleming

Easy to star tumbling on day 1. Noise level is much quieter that childs tumbler we previously used. Much larger capacity than other similar models. Great tumbler for beginners!

Royce Sharp
Love the tumbler, love the customer service more

Purchased this for my sister for her birthday. She absolutely loves it. Unfortunately, the tumbler motor we received was faulty and stopped working at the start of the 4th grit. She emailed customer service and they responded literally in 3 minutes. With in 10 minutes they shipped a replacement out for her. 10/10 recommend!

Raymond Rhodes
Great tumbler and makes beautiful rocks!

I wanted to tumble rocks for my retirement project. I have two Natural Geographic tumblers now and have them going nonstop. They do a great job and the rocks turn out beautiful!




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