I'm not sure of the mineral name, but it's a beautiful necklace with sparkling, glittering cut surfaces. From a distance, it could almost pass for a black diamond. I'm not sure where it was purchased, as my mother bought it. The length is approximately 42cm with an additional 5cm adjuster. It might suit men as well, if the size is right. The clasp is gold-colored and stamped with S925, but the jump rings and the heart-shaped dangle are slightly discolored. The necklace only will be shipped via Yu-Packet Post Mini. Thank you for looking. GSTV