According to Walter Schumann’s book, Gemstones of the World, there are about 200 different varieties of gemstones in the world. Yet most people can list the common ones and venture so far as to name a few rare gems as well. But here are 10 really rare gemstones you might not have heard about. And some of them look really alien.

Tanzanite – Tanzania

Black Opal – Australia

Larimar – The Dominican Republic

Tourmaline – Brazil

Grandidierite – Madagascar

Alexandrite – Russia

Benitoite – USA

Painite – Myanmar

Red Beryl – Mexico

Taaffiete – Sri Lanka

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