USA, Southern and central Africa, green, blue, China, India, USA, Italy, green, blue, China, India, USA, Italy
Afghanistan, Pakistan, Burma, Brazil, Madagascar, USA, Canada, Russia, Madagascar, Brazil, Canada, Mexico, Madagascar, Brazil, Canada, Mexico
Uneven, Uneven, Gemstones of the world (2001) More from other references
Gemstones of the world (2001), UnevenWalter Schumann, Gemstones of the world (2001)