I just love these with their gorgeous blue color. Lapis comes from Afghanistan, mined so deep in the mountains that it must be all carried out on the backs of donkeys! Some of these pieces have areas of soft grey that add texture and depth. And many contain extremely tiny sprinkles of pyrite, which make the stones glisten under bright light. The cabochons average 3.5 to 4mm thick, with polished backs and nearly flat faces. The inlay pieces are much thinner, and must be set into metal so that their faces are flush with the surface for protection.