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Antique marquise shape diamond cluster ring. Vertically set with three central round old cut diamonds graduated from centre and encircled by a single row of twelve round old cut diamonds, all in open back millegrain bead settings with an approximate combined weight of 1.00 carats, to an elegant oval pierced cluster form with ornate openwork gallery to raised smoothly tapering shoulders a solid flat shank. Tested platinum, circa 1905.