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Colombian emerald and diamond three stone ring. Set to centre with a cushion shape old cut natural Colombian emerald with no colour enhancement in an open back claw setting with an approximate weight of 1.75 carats, set to either side with two cushion shape old mine diamonds in open back claw settings with an approximate total weight of 1.60 carats, to a graduating three stone design with pierced ornate collets, open backholing and flanked by raised shoulders supported by cheniers and scrolls, and on a D-shape shank. Tested platinum, circa 1910, accompanied by Gem & Pearl Laboratory report #07543.