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 characteristic deep, shiny black color. Black Onyx is the top-selling chalcedony in the jewelry market and has a rich history in Art Deco design. These cushion buff top, single bevel cabochons feature a drilled hole and uniform opaque black color, making them well-suited for pendants, earrings, and other fabricated jewelry applications.
Features
- Genuine black onyx (dyed black chalcedony)
- Cushion buff top with single bevel profile
- Drilled hole for easy setting or stringing
- Uniform opaque black color throughout
- Historically popular in Art Deco jewelry styles
- Clean with warm, soapy water — ultrasonic and steam cleaning generally safe
Specifications
| Stone Type |
Black Onyx (Dyed Black Chalcedony) |
| Treatment |
Dyed |
| Shape |
Cushion Buff Top, Single Bevel |
| Feature |
Drilled hole |
| Transparency |
Opaque |
| Color |
Uniform black |
| Care |
Warm soapy water; ultrasonic and steam cleaning generally safe |
| Sold As |
Individual stone |
Available Options
| Part # |
Stone Size |
| 947-452 |
12mm x 10mm |
| 947-453 |
14mm x 12mm |
California Prop 65 Warning: