Aeschynite is a rare earth mineral that rarely forms in crystals large enough for faceting. This stone is most likely Aeschynite-(Y) because it is the most common of the Aeschynite species out there. This "Rectangle" cut stone isn't gem quality, but it is a unique gem from Afghanistan. The stone is essentially black, but I doubt very highly that most collectors have even seen a cut stone of this material, let alone have one in their collections, ESPECIALLY over TWO carats! This is a super rare gem and would make a perfect fit in any rare stone collection!