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.
| 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 |
| Part # | Size |
|---|---|
| 947-112 | 12x10mm |
| 947-113 | 14x12mm |
| 947-114 | 16x12mm |
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