Australian Solid Black Crystal Opal with Green Blue Colors Light Opals 7B1:Faint B2 :Dull B3:Bright B4:Very

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

N1-N4:Black Opal     N5-N6:Dark Opal     N7-N9:Light Opal

9 mm)Britain/Australia M1/2Asia 13Euro 52

53 mm approxThickness : 3

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Australian Solid Black Crystal Opal with Green Blue Colors Light Opals 7B1:Faint B2 :Dull B3:Bright B4:VeryLightning Ridge Solid Natural Black Crystal Opal. Opal Type : Solid Australian Black Crystal Opal Carat Weight : 1. 76 ct Size : 7. 83 mm x 10. 80 mm approx Thickness : 3. 31 mm Color : Green Blue Shape : Oval Cut : Medium Dome Cabochon Clarity : Translucent Brightness B1 B5 : B3. 6 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 :