Natural Lightning Ridge Solid Black Opal with Red Green Colors. unset 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

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35 mm approx

39 mm approx

Natural Lightning Ridge Solid Black Opal with Red Green Colors. unset opals 7B1:Faint B2:Dull B3:Bright B4:Very BrightAustralian Solid Natural Polished Black Opal. Opal Type : Solid Australian Black Opal Carat Weight : 1. 10 ct Size : 6. 65 mm x 8. 40 mm approx Thickness : 3. 23 mm Color : Red Green Shape : Oval Cut : Medium Dome Cabochon Clarity : Semi Translucent Brightness B1 B5 : B3. 5 B1: Faint B2: Dull B3: Bright B4: Very Bright B5: Brilliant Body Tone N1 N9 : N3 Black Opal N1 N4: Black Opal N5 N6: Dark Opal N7 N9: Light Opal Treatment : NONE Origin : Lightning