Masriera, an enamel and diamond brooch

Masriera, an enamel and diamond brooch, designed in the Art Nouveau style as a Morning Glory vine, the flowers in blue enamel, the leaves in translucent green plique à jour enamel, accented with brilliant-cut diamonds and suspending a cultured pearl, mounted in gold, length 5.3cm, signed Masriera, numbered A6593A, stamped 750, fitted case stamped Masriera, accompanied by a Masriera booklet