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Burmese sapphire and diamond coronet cluster ring. Set with a round old cut natural unenhanced Burmese sapphire in an open back claw setting with an approximate weight of 3.51 carats, bordered by a single row of ten round old cut diamonds in open back rubover and claw settings with a combined approximate weight of 1.70 carats, to a circular cluster with a finely pierced gallery and fancy backholing, the gently sloping shoulders lead through to a solid D-shape shank. Marked platinum, French, circa 1910, accompanied by Gemmological Certification Services report #5776-4863.