• Semi-black opal - opal gems

    Black Opal

    Semi-black opal: Australia (approximately 10 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

    GemstoneBlack Opal, Opal Stone, Precious Opal
    Natural or man madeNatural
    OriginAustralia
    Gem StateCabochon
    ColorBlack
    TransparencyOpaque
    Photo phenomenaPlay of Color