Long before they’re polished and set in gold, the world’s greatest gems sleep beneath mountains, rivers, and deserts. Their origins are as captivating as their glow: volcanic depths, ocean floors, and ...

A Carthage man may have unearthed one of the rarest gemstones in the world — not in a mine, but in his own front yard. Robert Lewis Jr. says he found an unusual black rock just steps from his home ...