Sardonyx is the traditional or ancient birthstone for August. “Gem with Intaglio with Bellerophon and Pegasos,” sardonyx and gold, early 1st century CE, Roman Empire, from the collection of the Walters Art Museum. Licensed under CC By-SA 3.0.
Translucent White Chalcedony Carved in Brooch
The traditional or ancient birthstone for August, sardonyx is red and white layered onyx, a variety of chalcedony, itself a variety of quartz. Gem with intaglio of Bellerophon and Pegasus, sardonyx and gold, early 1st century CE, Roman Empire, from the collection of the Walters Art Museum. Photo licensed under CC By-SA 3.0.
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Credit: Photo
| Gemstone | Quartz, Chalcedony |
| Natural or man made | Natural |
| Jewelry type | Brooch |
| Gem State | Carved |
| Color | White, Brown |
| Transparency | Translucent |
| Multi-color | Bi-color |