Tsavorite

Tsavorite or tsavolite is a variety of the garnet group species grossular, a calcium-aluminium garnet with the formula Ca₃Al₂Si₃O₁₂. Trace amounts of vanadium or chromium provide the green color.

In 1967, British gem prospector and geologist Campbell R. Bridges discovered a deposit of green grossular in the mountains of north-east Tanzania in a place called Lemshuko, 15 km (9.3 mi) away from Komolo, the first village. The specimens he found were of very intense color and of high transparency. The find interested the gem trade, and attempts were made to export the stones, but the Tanzanian government did not provide permits.