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Edwardian sapphire and diamond coronet cluster ring. Set centrally with one cushion shape old mine natural unenhanced sapphire in an open back claw setting with an approximate weight of 1.10 carats, surrounded by nine cushion shape old mine diamonds in open back claw settings with a combined approximate weight of 0.90 carats, to a coronet cluster featuring graceful claws, intricately pierced gallery and fancy backholing leading to tapering shoulders, flowing through to a solid D-shape shank. Tested platinum, circa 1910, accompanied by Gemmological Certification Services report #79199-18.