• Gilson opals - synthetic opal gems

    Opal Stone – Lab-made, Cabochon, Red

    Opal gems synthesized through a process created by Pierre Gilson appear very natural. Gilson opals: cabochons from 3 to 6 cts. Photo © Joel E. Arem, PhD, FGA. Used with permission.

    Article: Opal Stones and Gems: Value, Price, and Jewelry Information

    Credit: Joel E. Arem, PhD, FGA

    GemstoneOpal Stone
    Natural or man madeLab-made
    Gem StateCabochon
    ColorRed, White, Brown