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Diamond and sapphirecluster ring. Set to centre with one round old cut diamond in an open backrubover setting with an approximate weight of 0.75 carats, further set with four calibré French cut sapphires in open back rubover settings with a combined approximate weight of 0.60 carats, surrounded by twenty eight round eight cutdiamonds in open back grain settings with a combined weight of 0.50 carats. The total approximate diamond weight is 1.25 carats, to an ornate bombé design featuring intricate openwork, millegrain edging and open backholing, leading to smooth shoulders with grooved details and flowing through to a solid shank. Testedplatinum, circa 1920.