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Diamond coronet cluster ring. Set with a round old cut diamond to center in an open back grain setting with a weight of 0.65 carats, surrounded by eight round old cut diamonds in open back grain settings with a weight of 0.80 carats. The total approximate diamond weight is 1.45 carats, to an elegant round cluster with scrolling openwork gallery with fancy backholing, the shoulders leading smoothly down to a solid D-shape shank. Tested platinum, circa 1920.