Natural light streams in from a wall-to-wall window where Eric, a diamond cutter (whose surname must remain a secret), is preparing a 782-carat rough diamond the size of a baseball to be sliced by an ...

The overall diamond industry has seen gigantic changes lately, on a very basic level as a result of the climb of lab-grown ...

A hand-held flashlight reveals the green color of a rough emerald from the Coscuez Emerald mine in Colombia. Photo by Eric Welch/GIA. Emerald is the green to bluish green variety of beryl, a mineral ...

Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading ...