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Plique-a-jour

plique·a·jour | ˌplēk-(ˌ)ä-ˈzhu̇r

noun

A form of cloisonne in which the enamel in the cells has no backing, producing a translucent effect

This technique was used to good effect by Rene' Lalique and others during the Art Nouveau period to depict dragonfly wings and other translucent objects