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 ...
With the withdrawal of Soviet troops from Afghanistan, villagers in the Panjshir Valley are turning their attention to the emerald riches of the nearby Hindu Kush Mountains. Large, dark green crystals ...
Decorative glass is often made to capture the vivid color and intense sparkle of gemstones. It isn’t limited to transparent stones, either. A type of opaque matte glass called opal glass or opaline ...