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Sapphire and diamond coronet cluster ring in platinum. Set with an octagonal old cut natural unenhanced sapphire to centre with an approximate weight of 0.75 carats in an open back rubover millegrain setting, surrounded by eight round diamonds with an approximate total weight of 1.40 carats, similarly set in open back rubover millegrain settings, to a square floraform cluster with an ornate scrolling pierced gallery with elegant split tri-part shoulders, flowing smoothly down to a solid shank. Marked platinum, circa 1920.