18kt white gold sapphire and diamond cluster ring

18kt white gold sapphire and diamond cluster ring. Set with a 1.00ct oval mixed cut sapphire in a four claw setting, bordered by a row of round brilliant cut diamonds in claw settings, to an oval cluster with open radiating gallery and squared tapered shoulders which smooth to a solid shank. Estimated total diamond weight 0.55cts. Hallmarked 18kt gold.