Black Onyx, also known as black agate, is dyed black chalcedony. Chalcedony is composed of tiny quartz crystals not visible to the naked eye. Natural black chalcedony is exceptionally rare — virtually all black chalcedony on the market is grey chalcedony that has been chemically treated to achieve its signature deep, uniform black color. Black Onyx is the top-selling chalcedony in the gemstone market and has a storied history in Art Deco jewelry design. These genuine cabochons are offered in calibrated sizes, making them well-suited for setting in standard mountings.
Features
- Genuine black onyx (dyed black chalcedony)
- Buff top, single bevel cabochon profile
- Uniform opaque black color throughout
- Calibrated sizes for consistent fit in standard settings
- Treatment: Dyed
- Clean with warm, soapy water; ultrasonic and steam cleaning are generally safe
Specifications
| Stone Type |
Genuine Black Onyx (Dyed Black Chalcedony) |
| Cut Style |
Buff Top, Single Bevel Cabochon |
| Color |
Uniform Opaque Black |
| Treatment |
Dyed |
| Sizing Type |
Calibrated |
| Care |
Warm soapy water; ultrasonic and steam cleaning generally safe |
Available Options
| Part # |
Size |
| 947-112 |
12x10mm |
| 947-113 |
14x12mm |
| 947-114 |
16x12mm |
California Prop 65 Warning: