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Royal Blue sapphire and diamond three stone ring. Centrally set with a cushion shape old cut natural unenhanced Royal Blue Burmese sapphire in an open back split claw setting with an approximate weight of 2.63 carats, flanked by two round old cut diamonds in open back split platinum claw settings with an approximate combined weight of 0.90 carats, to ornate curving pierced claws and circular backholing, flanked by inward tapered shoulders with cheniers, flowing down to a solid D-shape shank. Marked 18 carat yellow gold and platinum, English, circa 1920, accompanied by Gem Research Swisslab (GRS) report #2017-047012.