The Danburite crystal weighs 63.20 cts (12+ grams), the cut Octagonal stone weighs 5.79 carats. Danburite crystals are notoriously damaged, and finding a sizeable one with no dings and some clarity is remarkably difficult. Danburite has a hardness of 7 - 7.5, and has a higher refractory index than a diamond, so as a cut stone it is quite sparkly. It is a Calcium Borosilicate, and it is taken out of a zinc mine by enterprising Mexican miners. Lately production has been very poor, with primarily "lechosa," or "milky" crystals being found. The crystal is very transparent, and a 10 + carat stone could be cut from it. There is an extremely small chip on the back side of the termination, but is very hard to see.