National Geographic Starter Rock Tumbler Kit for Kids and Adults
- Rubber-lined leak-proof barrel, spill-proof
- 4 levels of grit for polishing in stages
- Half pound of stones, 5 jewelry fastenings
- Ages 8 and up
- 1.9 kg, 10.98 x 5.2 x 12 inches
- 30 pieces in the kit
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A starter rock tumbling kit with a barrel, grits, rough stones and a few jewelry fastenings. It polishes stones and does not make finished jewelry on its own.
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ASIN: B01I56RV0CModel: NGTUMBLER2Category: Rock Tumblers
Overview
A kitchen table or workbench is where this hobby tumbler goes to work, with a leak-proof, rubber-lined barrel and four stages of grit. Rough stones and jewelry fastenings are included for turning polished stones into pieces.
Everything for a first batch of stones is in the box, and the leak-proof barrel is the main safeguard against mess. The listing names no power source or run time, and a half pound of stones is a small first batch.
Who it's for
A curious beginner with a table and patience for staged polishing is the match. Hobbyists wanting a bigger barrel or faster results should look at a larger tumbler.
Pros and cons
- Leak-proof rubber-lined barrel
- Four levels of grit included
- Stones and fastenings included
- Geology and STEM learning
- Power source not listed
- Small first batch of stones
- Polishing is a staged, slow process
- Not finished jewelry
Performance notes
Rough stones tumble in the barrel with grit and are polished in stages from coarse to fine, so results depend on running each grit stage fully. Barrel loading and stone type govern how smooth the stones come out.
Specifications
| Brand | Blue Marble |
|---|---|
| Model | NGTUMBLER2 |
| Dimensions & fit | |
| Dimensions | 10.98 x 5.2 x 12 inches |
| Weight | 1.9 kg |
| Included components | |
| In the box | Rock tumbler, rubber-lined barrel, 4 levels of grit, 1/2 pound of stones, 5 jewelry fastenings |
| Pieces | 30 |
| Other details | |
| Kit type | Rock polishing |
| Recommended age | 8 years and up |
| Features | Leak-proof, spill-proof |
| Theme | Geology |
Frequently asked questions
Is the National Geographic starter rock tumbler a jewelry kit?
No. It is a rock polishing kit. The listing includes 5 jewelry fastenings and rough stones, but you polish the stones yourself first.
What comes with the National Geographic starter rock tumbler?
The tumbler with a rubber-lined barrel, 4 levels of grit, half a pound of stones and 5 jewelry fastenings.
Is the National Geographic rock tumbler leak-proof?
The listing calls the barrel leak-proof and the kit spill-proof.