• Chatham ruby crystals

    Ruby – Lab-made, Rough, Red

    Chatham rubies are created via a flux solution method. The largest of these Chatham ruby crystals measure about a half-inch across. Photo © Joel E. Arem, PhD, FGA. Used with permission.

    Article: What is the Best Synthetic Corundum?

    Credit: Joel E. Arem, PhD, FGA

    GemstoneRuby, Corundum
    Natural or man madeLab-made
    Gem StateRough