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Antique emerald and diamond coronet cluster ring. Set with a rectangular emerald-cut natural Colombian emerald with no enhancement and no clarity enhancement in an open back claw setting with an approximate weight of 1.70 carats, encircled by a row of round old cut diamonds in open back claw settings and further to the shoulders in grain settings, twenty four in total with an approximate combined weight of 0.70 carats, all to an elegant square cluster with pierced claws and intricate pierced backholing, smoothly conforming to the finger with a solid D-shape tapered shank. Tested 18 carat yellow gold with platinum, circa 1910, accompanied by Gem & Pearl Laboratory report #09084.