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💎 Turn rough stones into polished treasures—quietly, precisely, brilliantly!
The National Geographic Platinum Series Ultimate Rock Tumbler Kit is a professional-grade, ultra-quiet rock polisher featuring a large 2-pound barrel, three-speed settings with a patented agitate mode, and an easy-set timer for hours or days. This all-in-one kit includes rough rocks, multiple grit bags, a patented GemFoam polisher for a brilliant finish, a strainer, and jewelry fastenings, making it perfect for both kids and adults to explore geology and create stunning gemstones at home.





| Age Range Description | 8 years and up |
| Asin | B0C2JN3S9M |
| Brand Name | Blue Marble |
| Customer Reviews | 4.3 4.3 out of 5 stars (591) 4.3 out of 5 stars |
| Educational Objective | Development of exploratory skills and manual dexterity |
| Included Components | Platinum Series Ultra Quiet Gem Polisher Kit |
| Is Assembly Required | No |
| Item Dimensions | 40.9 x 19.4 x 34.7 centimeters |
| Item Type Name | Ultra Quiet Rock Tumbler Kit |
| Item Weight | 907 g |
| Manufacturer | Blue Marble |
| Manufacturer Maximum Age Months | 1188.0 |
| Manufacturer Minimum Age Months | 96.0 |
| Manufacturer Part Number | NGULTTUMBLER2 |
| Material Type | Multiple |
| Model Number | NGULTTUMBLER2 |
| Number Of Items | 1 |
| Number Of Packs | 1 |
| Set Name | Rock Tumbler Kit with Polisher, Rocks, Grit, and Accessories |
| Size | L |
| Sub Brand | National Geographic |
| Theme | Geology |
| Unit Count | 1.0 Count |
| Upc | 810070622329 |
User
Present for partner
Got this for a present for my partner and he loves it.This one was a upgrade from the last one he has, it has a bigger barrel. And it really is super quiet. It's out in the garage and every time I'm out there, I keep thinking I have washing on. Highly recommend.
User
Pretty awesome project for my kindergartener!
Santa really came through this year! He brought my 5.5 year old a rock tumbler. He’s neurodivergent and his special interest has been gemstone collecting the last couple years. He’s found some really cool raw amethyst and carnelian, so I thought it might be fun to polish them.This thing is SO quiet (for a rock tumbler). This is the first time I’ve used one since I was a kid. My bro had one in the 90s and I remember it being so loud! It was in the corner of the garage and sounded like rocks in a dryer. I’m impressed with how easy it was to set up. The instructions were easy to follow for beginners. At first I thought they forgot to add the raw stones and grits, but they were inside the barrel. The polishing grit packets are one-time-use only, so I made sure to get some refills for future batches.The raw stones it came with are so pretty. He got a huge piece of tiger’s eye! He added some moonstone and fire opal. I’m curious to see how the small chips turn out…. Will they grind down to sand?!?Like I said, the barrel is pretty quiet considering it has a ton of rocks! He has it in his bedroom for white noise, lol.The settings are easy to figure out. The screen is bright and pretty. Love the little cover to dampen the sound.So far so good. I’ll update in a month!EARLY UPDATE - ok so we’re about 12 days in and on Grit #2. It’s working so well!!! It’s simple enough that he can change the settings (timer and level) by himself. I love that we can pause it to check on it. I put reminders in my phone to check it 2x/day just to make sure it’s not getting hot or too loud. There’s a ton of powdery sand already! The edge of the rocks all smoothed down in about 3 days. Now we’re watching some turn into little chips…. There’s still a lot of big ones, but it seems like half or more of the raw stones it came with will turn into sand or maybe tiny sparkles. Bummer. So excited to see how they turn out!Update: they’re SO PRETTY!!! Took us 6 weeks because we forgot about them sometimes 😅
User
Works great but noisy?
I love this tumbler! Sadly, the barrel popped only 3 months after I bought it and it's been making this clicking sound since. I think it was from tumbling pyrite? I cleaned it as best I could but the clicking persists. Can't find any tips on how to resolve it.
User
Amazing
Good for polishing beach rocks/glass
User
Rock machine
Is now half way through its first month long polishing cycle. So far is working very well, and the results are good
Trustpilot
1 day ago
2 months ago