Natural Omphacite Jadeite 天然绿辉石翡翠 is well known in the trade as 墨翠. Black Omphacite Jadeite Jade is extremely rare due to the environmental conditions necessary for this type of super dark green crystalized material to naturally occur deep within the earth's crust. This unique material appears a shiny blacken green while under overhead lights/daylight and a brilliant green when placed over a transmitted light source. • Inner Diameter = 51mm • Width = 12.8mm • Thickness = 8.7mm • Treatment = None (No Enhancement) • Color = Piano Black Green • Cut = Excellent 3D Effect as shown in pictures • Country of Origin = Myanmar/Burma • Include = Zip Lock Bag, Elegant Box/Bag A-grade jadeite, the highest quality, is used for jewelry and higher-priced carved pieces. It is not treated to enhance color or remove blemishes.