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Antique natural Ceylon sapphire and diamond coronet cluster ring. Set with a cushion shape old cut natural unenhanced Ceylon sapphire to centre with an approximate weight of 1.88 carats in an open back grain setting, surrounded by a single row of eight cushion shape old cut diamonds in open back raised claw settings with an approximate combined weight of 1.60 carats, to a circular cluster with intricate pierced backholing and flanked by heavy conforming fluted shoulders, to a solid ridged shank. Tested yellow gold, maker's mark 'AE', circa 1890, accompanied by Gemmological Certification Services report #78166-96.