• Australian black opals - opal types

    Black Opal

    One of the rarest opal types, black opals from Australia. © Joel E. Arem, PhD, FGA. Used with permission.

    Article: Eight Opal Types Explained

    Credit: Joel E. Arem, PhD, FGA

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