• sterling opal - synthetic opal types

    Opal Stone – Lab-made, Tumbled, Green

    While most Sterling opals show black potch lines, some lapidaries cut cabochons without these features. © Opal Auctions. Used with permission.

    Article: Synthetic Opal Types

    Credit: Opal Auctions

    GemstoneOpal Stone
    Natural or man madeLab-made
    Gem StateTumbled
    Photo phenomenaPlay of Color