Late Edwardian graduating ruby and diamond five stone ring

Late Edwardian graduating ruby and diamond five stone ring in platinum. Centred with a round mixed cut ruby in a split claw setting, flanked by two cushion shape Old European cut diamonds in split claw settings, further flanked by two cushion shape mixed cut rubies in split claw settings, to an elegant graduating five stone ring with curving claws, detailed openwork gallery and met to either side with slightly trumpeting raised shoulders supported by cheniers which flow to a solid shank. Estimated total ruby weight 0.90cts. Estimated total diamond weight 0.70cts. Numbered '52'.