Belle Epoque tiara, 1911 (enamel, diamonds, platinum & gold)

Of Kokoshnik design, composed of a series of graduated translucent royal blue plique-à-jour enamel curved panels, each overlaid with old-cut diamond trailing forget-me-not floral motifs, interspersed with collet-set diamond lines, to the cushion-shaped diamond openwork cartouche centre and similarly-set upper border, circa 1910, mounted in platinum and gold, with a later fitted case created in Paris in 1911 by Joseph Chaumet for the wife of the English nobleman, the 2nd Duke of Westminster (1879-1953), Duchess Constance, known as Shelagh (1876-1953)