Van Cleef & Arpels, an onyx, ruby, emerald and diamond brooch

Van Cleef & Arpels, an onyx, ruby, emerald and diamond brooch, 'Chat Malicieux', circa 1959, designed as a winking cat, its body set with an onyx cabochon, its nose set with an oval ruby, its eye an emerald cabochon lined with brilliant-cut diamonds, mounted in gold, length 5cm, signed Van Cleef & Arpels, dated 1959, stamped 750