25 Carat 2X4 Marquise Cut Tanzanite Natural Loose Gemstones Wholesale Lot w/ Beverly Oaks LLC Exclusive Certificate of Authenticity NATURAL REAL TANZANITE GEMSTONES WHOLESALE LOT FOR JEWELERS 25 CARAT 2X4 MARQUISE CUT TANZANITE HARDNESS 6.5 ON MOHS SCALE DECEMBER BIRTHSTONE