Belle Epoque diamond ribbon bow brooch, Cartier designed as an open-work ribbon bow, millegrain-set with circular and single-cut diamonds, weighing approximately 7,50 carats, with articulated ribbons, detachable screw to the reverse and engravedchoker ribbon fitting, stamped 6361, with French assay mark for gold, fitted gilt -tooled red leather case by CARTIER, LONDON, 175 New Bond Street, PARIS, 13 Rue de la Paix, NEW YORK, 712 5th Avenue