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Sapphire and diamond cluster ring. Set with one oval old cut natural unenhanced sapphire in an open back rubover setting with an approximate weight of 1.20 carats, additionally set with twenty two round mixed cut diamonds in open back grain settings with a combined approximate weight of 0.70 carats, to an octagonal shaped openwork cluster with millegrain borders, an elaborately pierced scrolling gallery, open backholing and engraved decoration to the sides of the smoothly conforming shoulders and a slim D-shape shank. Marked platinum, maker's mark 'R&F', indistinctly numbered, circa 1915.