When it was auctioned off at Sotheby’s Geneva in May 2011, it set a new record as the most expensive tiara ever sold at auction. The tiara features emeralds from Colombia and a base of large, ...

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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 ...