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Antique sapphire and diamond coronet cluster ring. Centrally set with a cushion shape old cut natural unenhanced sapphire in an open back claw setting with an approximate weight of 1.00 carats, encircled by a single row of ten cushion shape old cut diamonds in open back grain and rubover millegrain settings with a combined approximate weight of 0.50 carats, to an attractive circular cluster with softly scalloped edge with a pierced openwork gallery with cheniers and fancy backholing, flanked by split scrolling shoulders terminating in ridged detail and flowing through to a solid D-shape shank. Tested platinum, circa 1910, accompanied by a Gemmological Certifcation Services report #79186-59.