Grandidierite

10 Gemstones Much Rarer Than Diamond 

This bluish-green mineral is found almost exclusively in Madagascar, though the first (and, presumably, only) clean faceted specimen (described here) was recovered from Sri Lanka. Like alexandrite and tanzinite, grandidierite is pleochroic, and can transmit blue, green, and white light. [Photo Credit: Don Guennie |

You may also like...