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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 7.20 carats, surrounded by thirty two round old cut diamonds in open back grain settings with a combined approximate weight of 0.35 carats, to an impressive coronet cluster design featuring millegrain edging, an intricately pierced gallery and open backholing, the slightly raised tapering shoulders supported by cheniers, flowing to a solid D-shape shank. Marked platinum, circa 1920, accompanied by Gemmological Certification Services report #79224-31.