HENRI TETERGER b.1862 Superb Art Nouveau Pansy Pendant-Brooch Gold Plique-à-jour enamel Opal Diamond Pearl H: 6.8 cm (2.68 in)  W: 6.8 cm (2.68 in)  Marks: &#x27;Hri Teterger Fils&#x27; French, c.1900