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Colombian emerald and diamond cluster ring. Centrally set with an octagonal emerald-cut natural Colombian emerald with no colour enhancement and minor clarity enhancement in an open back four claw setting with an approximate weight of 1.77 carats, surrounded and flanked by eighteen round old cut diamonds in open back four claw settings with a combined approximate weight of 1.80 carats, to an elegantly raised coronet cluster with a finely pierced open gallery and shaped backholing, the open trumpeting shoulders curve to a solid ribbed shank. Marked platinum, maker's mark 'RP', French, circa 1960, accompanied by Gemmological Certification Services report #5776-6963.