This 9.02 g rough emerald contains a prominent eye-visible mobile inclusion. Photo by Robison McMurtry. Multiphase inclusions are key indicators when identifying emeralds and determining their origin.

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 ...