Good said lab-grown diamonds tend to cost about 30 to 40 percent less than mined diamonds of the same carat, colour, cut and clarity. Near New York City's Diamond District, gemologist David ...

Bey’s colossal 24-carat emerald-cut diamond. The Lorraine Schwartz rock, from her longtime partner Jay-Z, is thought to have cost over $5 million. James Packer, the Australian billionaire ...