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Royal Blue Burmese sapphire and diamond three stone ring. Set to centre with a cushion shape old cut natural unenhanced Royal Blue Burmese sapphire in an open back claw setting with an approximate weight of 1.48 carats, flanked by two round old cut diamonds in open back claw settings with a combined approximate weight of 0.80 carats, to an elegant three stone design featuring curving claws, a pierced openwork gallery and fancy open backholing, the inwardly tapering shoulders with chenier details smoothly flow down to a solid D-shape shank. Marked platinum, English, circa 1920, accompanied by Gem Research SwissLab (GRS) report #2016-021505.