Australian Solid Natural Polished Black Crystal Opal.
Opal Type : Solid Aussie Black Crystal Opal
Carat Weight : 2.18 ct
Size : 7.74 mm x 10.33 mm approx
Thickness : 4.72 mm
Color : Green Blue
Shape : Oval
Cut : Medium Dome Cabochon
Clarity : Translucent
Brightness B1 - B5 : B3.7
B1:Faint B2:Dull B3:Bright B4:Very Bright B5:Brilliant
Body Tone N1-N9 : N4 Black Opal
N1-N4:Black Opal N5-N6:Dark Opal N7-N9:Light Opal
Treatment : NONE
Origin : Lightning Ridge Opal Field, NSW Australia.