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Ceylon sapphire and diamond cluster ring. Set with a cushion shape old cut natural unenhanced Ceylon sapphire in an open back rubover setting with an approximate weight of 3.00 carats, further set with sixteen round old cut diamonds in open back grain settings with a combined approximate weight of 3.00 carats, to a tapered cluster design, featuring polished edges, a smoothly conforming gallery and ornate open backholing, flanked by trumpeting shoulders leading through to a solid D-shape shank. Marked platinum, maker's mark 'A P', French, circa 1930, accompanied by The Gem & Pearl Laboratory report #17945.