A large and very unusual Plique a jour enamel and silver Art Nouveau pendant. Plique a jour is a difficult enamel process, that involves suspending the enamel between silver or gold cells so that it becomes translucent when held to the light. The front section slides across to reveal a mirror. The front depicts an enamelled diaphanous lady playing a violin, amid flowers. It is most likely French, circa 1910. and is in very good condition.