Long before they’re polished and set in gold, the world’s greatest gems sleep beneath mountains, rivers, and deserts. Their ...

From the Hope Diamond to Queen Marie Antoinette’s pearl pendant, in this ultra-luxe category, $32 million serves as the more ...

Extreme geological events, like the kind that form mountains, can ‘deform’ a diamond, giving some their unique colors, experts said.

Commissioned by the Russian emperor Nicholas II, the diamond-covered Winter Egg is expected to fetch $27 million when it goes ...