Vintage sapphire and diamond ring by Oscar Heyman Brothers. Set with eight natural unenhanced square baguette cut sapphires in open back platinum bead and claw settings with an approximate combined weight of 1.58 carats, alternated by seven square emerald-cut diamonds in open back platinum bead and claw settings with an approximate combined weight of 1.12 carats, to a three row cluster on a curving bezel with intricate square backholing, to fluted sides and flanked by split wirework shoulders, tapering down to a solid ridged shank. Marked 18 carat yellow gold and platinum, maker's mark for Oscar Heyman Brothers, numbered '15186', American, circa 1960s.
