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Vintage Ceylon yellow sapphire ring. Set to centre with a cushion shape old mine natural unenhanced Ceylon yellow sapphire in an open back claw setting with an approximate weight of 5.50 carats, flanked by ten square step cut diamonds in open back channel settings with a combined approximate weight of 0.40 carats, to an impressive geometric design featuring curving claws, polished edges, a structured openwork gallery and fancy pierced backholing, the raised stepped shoulders graduating to a smooth D-shape shank. Marked platinum and tested yellow gold, circa 1950, accompanied by Gemmological Services Report #78143-32.