• sardonyx - birthstone gemology

    Chalcedony – Natural, Carved, White

    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.

    Article: Take the Birthstone Quiz

    Credit: Photo

    GemstoneQuartz, Chalcedony
    Natural or man madeNatural
    Jewelry typeBrooch
    Gem StateCarved
    ColorWhite, Brown