****Weight: 0.70 Ct. ****Origin: Madagascar. ****Quantity: 1 Piece. ****Color: Greenish Blue Color. ****Treatment: Natural. ****Clarity: Excellent. ****Dimensions: 6.65x4.55x3.46 mm. ****Gem Type: Faceted Grandidierite. ****DHL Shipping. # Grandidierite is a very rare mineral that was first discovered in southern Madagascar in the early 20th century. Since grandidierite is quite hard, high quality material has been cut as gemstones, making it one of the very rarest gems, in a class with varieties like benitoite, painite, taaffeite and jeremejevite. You will often see grandidierite included in lists of the 10 rarest gem varieties in the world.