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Edwardian emerald and diamond coronet cluster ring. Set to centre with a single rectangular emerald-cut natural unenhanced Colombian emerald in an open back claw setting with an approximate weight of 1.70 carats, encircled by a row of eighteen round old cut diamonds in open back claw settings with an approximate combined weight of 0.52 carats, further flanked by six round old cut diamonds in open back grain settings with a combined weight of 0.18 carats. The total approximate diamond weight is 0.70 carats, to an elegant coronet cluster with curving claws, an intricately pierced gallery and open backholing, leading to smooth tapering shoulders and flowing through to a solid D-shape shank. Tested 18 carat yellow gold and platinum, circa 1910, accompanied by Gem & Pearl Laboratory report #09084.