Art Deco diamond brooch; the openwork plaque brooch of buckle design, centring a bezel-set transitional brilliant-cut diamond weighing approximately 1.25 carats, upon a symmetrical geometric surround set throughout with channel-set baguette diamonds and millegrain bead-set round brilliant-cut diamonds together weighing approximately 1.60 carats and 6.54 carats respectively, mounted in platinum, length 65 mm, width 37 mm, total gross weight approximately 26 grams, maker's mark.; accompanied by a fitted box.