AN ART NOUVEAU ENAMEL, DIAMOND, SAPPHIRE AND RUBY BROOCH, ca. 1890. Designed as a butterfly, the wings mounted en tremblant, the body set with one oval sapphire and old-mine-cut diamonds. The wings decorated with plique-à-jour enamel in blue-green tones, and set with four sapphire cabochons. The wing borders partially set with rose-cut diamonds. Probably of French.