This free form cabochon is cut from azurite, chrysocolla and tenorite.   From near the Blue Bird Mine in Globe, Arizona in the U.S.A.  It was hand cut in my cutting shop.  The polish is good the edges are cut for setting the stone in a bezel and the bottoms are flat.   A LITTLE DARKER THAN THE PHOTO SHOWS.

SIZE:(in millimeters) 25 x 17 x 4 MM THICK.
WEIGHT(Carats): 18
DOME: SLIGHTLY DOMED.
BOTTOM: FLAT.  
EDGE:  GOOD FOR BEZEL 
POLISH:  GOOD.