Chrysoberyl (variety: Alexandrite)
One of the most valuable gemstones is the variety of chrysoberyl known as alexandrite. Alexandrite is renowned for its color change from red under incandescent light, to green in daylight or fluorescent light. Alexandrite was discovered in 1830 in the Ural Mountains of Russia and named after Csar Alexander II. Sri Lanka and Brazil are the leading producers of alexandrite, but the finest quality color change gems have typically come from Russia. Photographed here under incandescent light is a 65.08 carat square-cushion cut alexandrite from Sri Lanka; a 16.69 carat cushion cut alexandrite from Sri Lanka; and a 4.84 carat emerald cut alexandrite from Russia.
Image Number: 95-40577
Catalog Number: G2042;G3407;G10065
Weight: 4.84-65.08 carats
G2042, Chamberlain Fund; G3407, Roebling Fund; G10065, Gift of Mr. Joseph P. Gorrell, 1995