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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 eleven cushion shape old mine diamonds in open back claw settings with a combined approximate weight of 1.20 carats, to a coronet cluster featuring delicate claws, intricately pierced gallery and fancy backholing leading to trumpeting shoulders, flowing through to a solid D-shape shank. Marked 18 carat yellow gold with platinum settings, French, circa 1910, accompanied by Gemmological Certification Services report #779199-87.