Lightning Ridge Solid Natural Polished Black Opal.
Opal Type : Solid Aussie Black Opal
Carat Weight : 1.78 ct
Size : 6.43 mm x 12.39 mm approx
Thickness : 4.23 mm
Color : Green Blue
Shape : Free Shape
Cut : Medium Double Dome Cabochon
Clarity : Opaque
Brightness B1 - B5 : B3.7
B1:Faint B2:Dull B3:Bright B4:Very Bright B5:Brilliant
Body Tone N1-N9 : N1 Black Opal
N1-N4:Black Opal N5-N6:Dark Opal N7-N9:Light Opal
Treatment : NONE
Origin : Lightning Ridge Opal Field, NSW Australia.