Lightning Ridge Natural Solid Crystal Opal with Green Blue Color Fires. Semi Black Opals 66 mmColor : Green BlueShape

66 mmColor : Green BlueShape : Free ShapeCut : Medium Dome Cabochon Clarity : OpaqueBrightness B1 - B5 : B3

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

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Pictures viewing from both sides

Cut : Low Dome Cabochon

Lightning Ridge Natural Solid Crystal Opal with Green Blue Color Fires. Semi Black Opals 66 mmColor : Green BlueShapeAustralian Solid Natural Crystal Opal. Pictures viewing from both sides. Opal Type : Solid Dark Crystal Opal Carat Weight : 1. 60 ct Size : 7. 50 mm x 12. 26 mm approx Thickness : 2. 90 mm Color : Green Blue Shape : Fancy Cut : Double Medium Dome Cabochon Clarity : Translucent Brightness B1 B5 : B4. 5 B1: Faint B2: Dull B3: Bright B4: Very Bright B5: Brilliant Body Tone N1 N9 : N6 Dark Opal N1 N4: Black Opal N5 N6: Dark Opal N7 N9: Light Opal