Onyx, photo by Simon Eugster. Licensed under CC By-SA 3.0.
Opaque Black Chalcedony Tumbled
Onyx, photo by Simon Eugster. Licensed under CC By-SA 3.0.
Article: Onyx Properties, Varieties, and Jewelry Information
Credit: Simon Eugster
| Gemstone | Quartz, Chalcedony, Onyx |
| Natural or man made | Natural |
| Gem State | Tumbled |
| Color | Black |
| Transparency | Opaque |