Enamel on reverse after a design by Etienne Delaune; Prudence; French; Paris; Enamel on reverse after a design by Etienne Delaune (French; Orl閍ns 1518/19-1583 Strasbourg); ca. 1550-60; back: 19th century; French; Paris; Chalcedony; mounted in gold with enamel; rubies; emeralds; diamond; and pearl; Overall; with pendant pearl; without bail: 3 3/16 x 1 7/8 in. (8.2 x 4.8 cm); Overall; central commesso: 1 9/16 x 1 7/16 in. (4 x 3.6 cm); 40 x 34.7 mm