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Antique sapphire and diamond coronet cluster ring. Set to centre with an octagonal old cut natural unenhanced sapphire in an open back rubover setting with an approximate weight of 0.75 carats, surrounded by eight round old cut diamonds in open back rubover settings with an approximate combined weight of 1.40 carats, to a square coronet cluster design featuring millegrain edging, an ornate scrolling pierced gallery and fancy open backholing, flanked by elegant tri-split shoulders with grooved detailing flowing smoothly down to a solid slim D-shape shank. Marked platinum, circa 1920.