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Ornate emerald and diamond coronet cluster ring. Set to the centre with an octagonal emerald-cutnaturalColombian emerald with no colour enhancement in an open backrubover setting with an approximate weight of 0.60 carats, surrounded by twenty round old cutdiamonds in open back grain settings with a combined weight of 1.40 carats, flanked by twelve round old cut diamonds in open back grain settings with a combined weight of 0.36 carats. The total approximate diamond weight is 1.76 carats, to an octagonal form featuring extremely ornate pierced scrolling metalwork and millegrain borders, supported by a conforming gallery with cheniers and intricate backholing, flanked by trumpeting shoulders and terminating in a slim grooved shank. Markediridium and platinum, American, circa 1920, accompanied by Gemmological Certification Services report #79178-10.