Black Onyx, also known as black agate, is dyed black chalcedony. Chalcedony is composed of microscopic quartz crystals not visible to the naked eye. Natural black chalcedony is exceptionally rare — virtually all black chalcedony available commercially is grey chalcedony that has been chemically treated to achieve its signature deep, opaque black color. Black Onyx is the top-selling chalcedony in the market and was a hallmark material in Art Deco jewelry design. These oval buff top double bevel cabochons feature a pre-drilled hole, making them ready for a variety of setting and stringing applications.
Features
- Genuine black onyx cabochons with uniform opaque black color
- Oval buff top with double bevel profile
- Pre-drilled hole for versatile use in jewelry applications
- Dyed black chalcedony — chemically treated for consistent, deep black appearance
- Clean with warm, soapy water; ultrasonic and steam cleaning are generally safe
Specifications
| Stone Type |
Black Onyx (dyed black chalcedony) |
| Shape |
Oval |
| Profile |
Buff top, double bevel |
| Feature |
Pre-drilled hole |
| Treatment |
Dyed |
| Opacity |
Opaque |
| Color |
Uniform black |
| Care |
Warm soapy water; ultrasonic and steam cleaning are generally safe |
Available Options
| Part # |
Stone Size |
| 947-851 |
9mm x 7mm |
| 947-853 |
14mm x 12mm |
California Prop 65 Warning: