14 karat white gold ring by Christoper Michael set with one 4.25 carats antique cushion tourmaline from the Democratic Republic of Congo, blue green color, VS clarity, cut grade excellent, measuring 8.4 mm wide, 10.6 mm long, 6.5 mm deep. The proportions of the tourmaline are as follows: total depth 77%. Cut by Steve Moriarty. The overall quality rating of this tanzanite is 913 out of 1000.  Tourmaline is likely heated to enhance color. The mounting weighs 6.4 grams