1Ct Natural Australian Black Opal, Lightning Ridge, Polished Stone, Electric Blues and Greens

1Ct Natural Australian Black Opal, Lightning Ridge, Polished Stone, Electric Blues and Greens. 7x5.6x3mm Its a beauty B3 to B4 and N2 black. Solid opal ready to set. Little sand spot on the side can be either brought in or covered by setting. The electric colour of green and blue is B5 when it flashes.