Platinum, emerald and diamond ring, circa 1920, the lozenge-shaped plaque centring a millegrain-set emerald-cut Colombian emerald weighing 2.85 carats is framed by a foliate surround pierced and millegrain-set with old mine-cut diamonds, the diamonds together weighing approximately 1.70 carats, size I1/2., accompanied by a GIA report numbered 2244350819, dated 8 December 2016, stating that the 2.85 carat emerald is natural, with minor clarity enhancement, of Columbian origin.