Dioptase on Calcite     Omaue Mine, Kaokveld, Namibia.  Ex. Anthony Dunn collection, circ. 1973.  This 3 x 2.7 x 2.1 cm piece has a single fine dioptase crystal placed high off its matrix.  Fantastic color and clarity.  Very tiny rub on edge of crystal is impossible to find without a loupe.  On sale for $176