A RUBY, GOLD AND ENAMEL PENDANT in the Renaissance style formed as a sea monster with open jaws, the body with an irregular rose-cut ruby between chased black and white enamel scales above blue enamel scrolls and four pendant pearls, the reverse with a formal design in black enamel, with short suspension chains attached to a cartouche- shaped link en suite, second half of the 19th Century, with French hibou customs mark