Lightning Ridge Natural Solid Polished Dark Opal with Multi-Colors. Dark Opals 7B1:Faint B2:Dull B3:Bright B4:Very Bright

7B1:Faint     B2:Dull     B3:Bright     B4:Very Bright     B5:BrilliantBody Tone N1-N9 : N2 Black OpalN1-N4:Black Opal     N5-N6:Dark Opal     N7-N9:Light OpalTreatment : NONEOrigin : Lightning Ridge Opal Field

5B1:Faint    B2:Dull    B3:Bright     B4:Very Bright     B5:BrilliantBody Tone N1-N9 : N8 Light OpalN1-N4:Black Opal     N5-N6:Dark Opal     N7-N9:Light OpalTreatment : NONEOrigin : Coober Pedy Opal Field

83 mm approx

32 mmColor : Green Blue with a touch of YellowShape : FancyCut : Medium Dome Cabochon Clarity : TranslucentBrightness B1 - B5 : B3

Opal Type : Solid Dark Crystal Opal

Lightning Ridge Natural Solid Polished Dark Opal with Multi-Colors. Dark Opals 7B1:Faint B2:Dull B3:Bright B4:Very BrightAustralian Solid Natural Polished Dark Opal. Opal Type : Solid Dark Opal Carat Weight : 2. 41 ct Size : 7. 50 mm x 12. 96 mm approx Thickness : 4. 22 mm Color : Multi Color Shape : Free Shape Cut : Medium Dome Cabochon Clarity : Opaque Brightness B1 B5 : B3. 5 B1: Faint B2: Dull B3: Bright B4: Very Bright B5: Brilliant Body Tone N1 N9 : N5 Dark Opal N1 N4: Black Opal N5 N6: Dark Opal N7 N9: Light Opal Treatment : NONE Origin : Lightning Ridge Opal