Coral, diamond and yellow sapphire 'Marco Polo' brooch, Nardi, Italy. Photo: Sotheby's.

Wearing a wide brimmed hat decorated with a fringe of briolette yellow sapphire drops and a jacket of carved coral, the hat and jacket sash embellished with numerous reversely-set round diamonds of golden brown hue, the total diamond weight approximately 3.10 carats, mounted in 18 karat gold and silver, signed Nardi, numbered M007045. 

Sotheby's. Magnificent Jewels. New York | 04 Dec 2007. http://www.sothebys.com