These crystals have the best, glassiest luster you could ever want in a Tsumeb azurite and are ALL TRANSPARENT, GEMMY BLUE when backlit! The piece looks like it has blue glass glued to it....This is a remarkable specimen of large size and incredible condition, pristine on all major crystals. Ex. Tom Hall Collection, purchased from dealer Rick Smith (in the 1970's). This is a truly fine display specimen of large size. Comes with custom-made lucite base. 9.5 x 9x 3 cm