Rock crystal, sapphire and diamond bangle, Boucheron, circa 1935
Cf.: Sylvie Raulet, Bijoux Art Déco, Paris, Editions du regard, 1984, pg. 159 and Gilles Neret, Boucheron Histoire d'une Dinastie de Joailliers, Lausanne 1988, pg. 158 for an illustration of this bangle.