Grandidierite – $20,000 per carat

 

Grandidierite (Credit: The Gem Trader)

Grandidierite (Credit: The Gem Trader)

Grandidierite ((Mg,Fe2+)Al3(BO3)(SiO4)O2) is a very rare gem that can fetch up to $20,000 per carat and was first discovered in Madagascar in 1902. It is commonly found as an accessory mineral on aluminous boron rich rocks with a pearly semitransparent bluish green hue.

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