Extremely Rare Grandidierite Gem Crystal From Madagascar - 0.8" - 18.0 Carats

This is an extremely rare bluish green Grandidierite crystal. It is semi-transluscent and is very large. This is considered by many to be one of the 10 rarest gemstones in the world.
Location: Madagascar
Size: 2.1 x 1.8 x 0.8 Centimeters
Weight: 3.6 Grams