National Geographic Rock Tumbler Refill Kit (3 lb Rough)
National Geographic’s 3 lb refill is the easiest rock tumbler rocks restock — amethyst, quartz, jasper, agate, and more plus a full grit cycle and jewelry findings for beginners who emptied their starter kit.
Features
- About 3 lb mixed rough gemstones
- Four grades of tumbling grit included
- Jewelry fastenings for finished stones
- Learning guide with stone facts
Pros and cons
| Pros | Cons |
|---|---|
| Rough + grit in one box | Not for 12 lb commercial loads alone |
| Huge review base | Mix varies by batch |
| Good variety for small barrels |
Activities and environments best for
- Nat Geo / hobby tumblers
- Gifts
- First rough refill
Overall
Best rocks for tumbling when you want grit and rough together.
