18ct white gold, opal and diamond ring, of cluster design, centring on an oval opal weighing 8.35 carats, claw-set within a double surround of brilliant-cut diamonds together weighing approximately 4.00 carats, size N1/2. Accompanied by a GSL report numbered AA55384, dated 13 July 2015, stating that the 8.35 carat gemstone is natural, variety dark crystal (N7), of Lightning Ridge, NSW origin.