Australian Solid Natural Crystal Opal.
Pictures viewing from both sides.
Opal Type : Solid Dark Crystal Opal
Carat Weight : 1.60 ct
Size : 7.50 mm x 12.26 mm approx
Thickness : 2.90 mm
Color : Green Blue
Shape : Fancy
Cut : Double Medium Dome Cabochon
Clarity : Translucent
Brightness B1 - B5 : B4.5
B1:Faint B2:Dull B3:Bright B4:Very Bright B5:Brilliant
Body Tone N1-N9 : N6 Dark Opal
N1-N4:Black Opal N5-N6:Dark Opal N7-N9:Light Opal
Treatment : NONE
Origin : Lightning Ridge Opal Field, NSW Australia