With a wingspan of 4 and 3/4 inches, this soaring Egyptian Revival scarab brooch – circa 1920s – glows with translucent turquoise blue and shaded green plique-a-jour enamel feathers. Crafted in 800 silver (possibly German or Austrian origin) – exotically striking and beautiful. Source link
Plique-à-jour (French for "letting in daylight") is a vitreous enamelling technique where the enamel is applied in cells, similar to cloisonné, but with no backing in the final product, so light can shine through the transparent or translucent enamel. Read more.