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Commesso, 1550–55 Reverse after design of Étienne Delaune (French, 1518/19–1583), probably a 19th-century addition Gold, enamel, jewels, and chalcedony. The commesso was a rare form of jewelry in which carved semiprecious stones were combined to form an integral part of the design. The technique flourished only briefly in the 16th century French court where Italian & French artists collaborated.

A plique-à-jour enamel and glass brooch, designed by Ivor Gordon. The central rectangular foiled eau-de-nil glass plaque by Lalique 1910, encased in a contemporary mount w/diamond terminals, issuing pale blue/green plique-à-jour enamel blooms to either side, w/brilliant-cut diamond highlights & entwined guilloche enamel stems, the central rectangular plaque signed Lalique, length 7.3cm