National Geographic Ultra Quiet Rock Tumbler Kit for Kids and Adults
- Ages 8 and up, STEM geology kit
- 2 lb barrel, ultra-quiet design
- 4-stage grit with GemFoam polish
- Rough gemstones and accessories included
- 16.1 x 7.64 x 13.66 inches, 2 pounds
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A rock tumbler kit for kids and adults who want to polish rough gemstones at home with a quieter motor. The listing does not spell out the accessory count or run times.
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ASIN: B0C2JN3S9MModel: NGULTTUMBLER2Category: Rock Tumblers
Overview
National Geographic branding appears on this Blue Marble kit, a Platinum Series ultra-quiet gem polisher with a barrel, rough stones, grit and polish. The four grit stages smooth the stones, and the polish step finishes them.
Anyone curious about geology gets a full path from rough rock to polished stone in one box. The listing leaves out how long each grit stage runs and how many stones come in the bag, so the exact results are not documented.
Who it's for
A kid aged eight or older working through an earth science project will find the kit complete enough to start. Adults wanting bigger loads or details on timing should look for a model that lists them.
Pros and cons
- Four grit stages
- GemFoam polish step
- Rough gemstones included
- STEM learning angle
- Stone count not listed
- Run time per stage not listed
- Small barrel capacity
- Cord and motor details not listed
Performance notes
A rotating barrel tumbles the stones against grit, moving through four stages from coarse to fine. The final foam polish step puts the shine on the stones, so results depend on following the stages in order.
Specifications
| Brand | Blue Marble |
|---|---|
| Model | NGULTTUMBLER2 |
| Dimensions & fit | |
| Dimensions | 16.1 x 7.64 x 13.66 inches |
| Weight | 2 pounds |
| Included components | |
| In the box | Platinum Series Ultra Quiet Gem Polisher Kit |
| Other details | |
| Capacity and motor | Ultra-quiet design, 2 lb barrel, rough gemstones, 4-stage grit, GemFoam polish |
| Product | Rock Tumbler Kit with Polisher, Rocks, Grit, and Accessories |
| Recommended age | 8 years and up |
| Sub brand | National Geographic |
| Theme | Earth Science |
Frequently asked questions
How do I care for the National Geographic rock tumbler between batches?
The listing does not give cleaning steps, so follow the instructions that come with the kit. It describes a four-stage grit process with a GemFoam polish.
How many stones are in the NGULTTUMBLER2 kit?
The listing says rough gemstones are included but does not give a count.
Is this tumbler quiet?
The listing describes an ultra-quiet design but gives no decibel figure.