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Ceylon yellow sapphire and diamond coronet cluster ring. Set to centre with a cushion shape old cut natural unenhanced Ceylon yellow sapphire in an open back rubover setting with an approximate weight of 5.26 carats, surrounded by twenty eight round eight cut diamonds in open back grain settings with a combined approximate weight of 0.50 carats, to an impressive coronet cluster with polished edges, a geometric pierced gallery and open backholing, the slightly raised shoulders flowing to a solid D-shape shank. Tested platinum, circa 1950, accompanied by a Gemmological Certification Services report #5774-225.