NATIONAL GEOGRAPHIC Professional Rock Tumbler Kit
- 2 lb barrel per the title
- 1 lb rough gemstones included
- 4 stage tumbling grit included
- GemFoam polishing media included
- Ages 8 and up per manufacturer
- 12.6 x 6.69 x 10.24 inches item size
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A complete rock tumbling kit with the tumbler, rough gemstones, four grit stages and polishing media. Power source and run time are not listed.
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ASIN: B086Z83SV5Model: NGPROTUMBLER3Category: Rock Tumblers
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Overview
Not a bare machine, this National Geographic kit bundles a professional tumbler with rough gemstones, stage grit and a patented foam polish. Jewelry fastenings are included for finished stones.
Having the stones, grit and polish together is the reason to choose a kit over a separate tumbler. The limits are a single small barrel and a listing that names no power source or run-time guidance.
Who it's for
Kids at the listed age and curious adults who want to try stone polishing with guidance. Serious hobbyists who process big batches should look at a larger machine.
Pros and cons
- Rough gemstones included
- Four stage grit included
- Patented foam polishing media
- Jewelry fastenings included
- Power source not listed
- Small barrel capacity
- Run time not described
Performance notes
Stones polish as they tumble against grit, and each grit stage smooths them further before the polishing media finishes the job. Results depend on following the stages in order, and the barrel size limits how many stones fit at once.
Specifications
| Brand | Blue Marble |
|---|---|
| Model | NGPROTUMBLER3 |
| Dimensions & fit | |
| Dimensions | 12.6 x 6.69 x 10.24 inches |
| Capacity & performance | |
| Barrel | 2 lb barrel (per title) |
| Construction & materials | |
| Material | Plastic |
| Included components | |
| In the box | 1 lb rough gemstones, 4 stage tumbling grit, GemFoam polishing media, jewelry fastenings, professional tumbler |
| Other details | |
| Educational objective | STEM, earth science |
| Recommended age | 8 years and up |
Frequently asked questions
What is in the box with the National Geographic Professional Rock Tumbler Kit?
1 lb of rough gemstones, 4 stage tumbling grit, GemFoam polishing media, jewelry fastenings and the professional tumbler.
How big is the barrel on the National Geographic tumbler?
The title says a 2 lb barrel. The listing gives no inside dimensions.
What powers the National Geographic rock tumbler?
The listing does not name a power source, so confirm with the seller.