A semi black opal and diamond cluster ring, 18ct white gold, antique styled as an oval cluster, featuring an oval cabochon semi black solid opal to centre, displaying orange, green and red rolling spectral colours, weighing approximately 1.00ct, bezel set in an open backed mount, framed by ten brilliant cut diamonds, each grain set with a fine rail spacing each, flanked by further diamonds set to shoulders, merging to a smooth band