Created circa 1905-1906, this diamond, moonstone, and carved crystal glass brooch by René Lalique is mounted in platinum. The brooch is designed as an elongated crystal plaque reverse-carved to depict the figure of a young woman loosely encircled by a diaphanous wrap, highlighted by a triangular sugarloaf moonstone, suspending an old mine-cut pear-shaped diamond of 2.51 carats (F color, SI1 clarity) accented by leafy diamond tendrils. Belonging to an early group of experimental glass jewels, this brooch conveys the subtle and evanescent beauty of organic forms, while exploring the interplay of precious gem materials with carved art crystal.