Diamond brooch, circa 1961; of spiral design, the tapering open-grooved ribbon accented with claw-set and bead-set round brilliant-cut diamonds to the buckle and along one edge, the diamonds together weighing approximately 1.70 carats, mounted in 18ct gold and platinum, length 45 mm, width 35 mm, total gross weight approximately 18 grams, British assay marks, maker's mark.