Vintage Oscar Heyman Brothers sapphire and diamond ring. Set with eight square baguette cut natural unenhanced sapphires in open back claw and grain settings with an approximate combined weight of 1.58 carats, alternated by seven square emerald-cut diamonds in open back claw and grain settings with an approximate combined weight of 1.12 carats, to a three row cluster featuring curving claws, polished edges and 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 1960.
