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Art Deco onyx and diamond ring. Centrally set with a sugarloaf pyramid shaped onyx to centre in an open back collet setting, encircled by a cluster of thirty cushion shape old cut diamonds in open back grain settings with an approximate combined weight of 3.00 carats, to a square cluster with stepped tri-part tapering shoulders and intricate pierced backholing, with a scrolling openwork gallery and a solid flat shank. Tested platinum, French control mark, circa 1935.