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Marcus & Co three stone diamond ring. Horizontally set with three round old cut diamonds in open back grain settings with an approximate combined weight of 3.00 carats, to an ornate three stone ring featuring octagonal collets with a pierced lattice design, intricate patterned engraving and circular backholing, the split shoulders supported by an elegant scrolled Fleur-de-Lis motif, with further patterned engraving to the tapering D-shape solid shank. Tested platinum, maker's mark 'MARCUS' for Marcus & Co, American, circa 1920.