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Cabochon Colombian emerald and diamond ring. Set with one central oval cabochon natural Colombian emerald with no colour enhancement in an open back claw setting with an approximate weight of 3.60 carats, half encircled by a scrolling row of thirteen rectangular baguette cut diamonds in open back claw settings with a total weight of 0.35 carats, and half encircled by a band of fifty round eight cut diamonds in open back grain settings with a total weight of 0.75 carats. The combined approximate diamond weight is 1.10 carats, to a swirling asymmetric cluster design with an openwork gallery, pierced backholing, with scrolling shoulders which lead on to a slim D-shape shank. Marked platinum and iridium, American, circa 1920, accompanied by Gemmological Certification Services report #78154-58.