Nicolo onyx gemstone (1.3 x 0.4 cm), Roman, 2nd-4th century CE. Rogers Fund, 1922. Metropolitan Museum of Art, New York. Public Domain.
Opaque White Chalcedony Carved
Nicolo onyx gemstone (1.3 x 0.4 cm), Roman, 2nd-4th century CE. Rogers Fund, 1922. Metropolitan Museum of Art, New York. Public Domain.
Article: Onyx Properties, Varieties, and Jewelry Information
Credit: Metropolitan Museum of Art, New York
| Gemstone | Quartz, Chalcedony, Onyx |
| Natural or man made | Natural |
| Width | 13 |
| Depth | 4 |
| Gem State | Carved |
| Color | White, Black |
| Transparency | Opaque |
| Multi-color | Bi-color |