A green or greenish-brown gemstone which glints varying shades of red under artificail light. The gem was discovered in the Ural mountains, Russia, in 1830, on the birthday of Tsar Alexander II. A synthetic form of CORUNDUM exhibits similar colour changes ad is sold in the Middle East as alexandrite, but is of little value.
Alexandrite is a variety of chrysoberyl. Named after Czar Alexander II, it is a color change stone that is green in daylight and light red in artificial light. Mined in Russia, Brazil, Burma, Ceylon, and Rhodesia. Laboratory-produced alexandrite is common, and it is often sold as natural alexandrite. Alexandrite has a hardness of 8.5 and a specific gravity of 3.64-3.74.