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Colombian emerald cabochon and diamond ring. Set with one central oval cabochon natural Colombian emerald with no colour enhancement in an open back claw and collet setting with an approximate weight of 7.50 carats, flanked by gently sloping shoulders set with six round old cut diamonds in open back bead settings with an approximate total weight of 0.12 carats, to a solitaire design with elaborate engraved detailing to the claws and gallery, open backholing and on a slim squared shank with further ornate engraved decoration and fine millegrain borders. Tested platinum, circa 1920, accompanied by Gemmological Certification Services report #78153-46.