Lightning Ridge Ring

Potch Opal Cabochon set in 925 Sterling Silver 

Size - L

This is a very unusual & unique opal.
Grey/Black Potch Opal with silica spheres of Agate/Blue/Amber. In certain light sparkles of amazing green flashes. 
Bezel set with hammered band.  Width 4.9mm
Stone Width - 11.3mm.   Length - 13.4mm.   Weight - 7 carats
Source - Lightning Ridge