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Vintage Colombian emerald ring. Set with an octagonal emerald-cut natural Colombian emerald with no colour enhancement in an open back four double claw setting with an approximate weight of 2.10 carats, flanked by two marquise shape old cut diamonds in open back claw and half rubover settings with a combined approximate weight of 0.50 carats, to a structured openwork collet with pierced backholing and gently sloping shoulders which lead through to a solid D-shape shank. Marked yellow gold, indistinct maker's mark, French, circa 1970, accompanied by Gemmological Certification Services report #5777-8728.