This is the most famous and expensive of all garnets. The African Tsavorite garnet was recently discovered in 1967 in East Africa. It has an emerald-like green color but is much more vivid and brilliant due to a higher refractive index. Tsavorite's are also much more durable than emeralds.
Tsavorite is extremely rare, and are found only in Tanzania, Kenya, and Madagascar. They are 200 times rarer than emeralds! Tsavorites are always left untreated.