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Royal Blue Burmese sapphire and diamond coronet cluster ring. Centrally set with an oval old cut natural unenhanced Royal Blue Burmese sapphire in an open back claw setting with an approximate weight of 1.00 carats, encircled by a single row of ten round old cut diamonds in open back grain and half rubover settings with a combined approximate weight of 0.80 carats, to an elegant coronet cluster design with scalloped edging, finely pierced gallery and fancy open backholing, flanked by trumpeting split shoulders which terminate to a solid ribbed shank. Tested platinum, circa 1915, accompanied by Gem Research SwissLab (GRS) report #2016-021511.