• platinum ring with diamonds and sugar-treated opal

    Opal Stone – Natural, Cabochon, Black

    Platinum ring with diamonds and a sugar-treated opal. Photo courtesy of liveauctioneers.com and Clars Auction Gallery.

    Article: Appraising Opals

    Credit: Clars Auction Gallery

    GemstoneOpal Stone
    TreatmentsDyeing, Heat Treatment
    Natural or man madeNatural
    Jewelry typeRing
    Gem StateCabochon
    Photo phenomenaPlay of Color