Cereal heiress Marjorie Merriweather Post once owned this 1880s French hummingbird-in-flight brooch paved with rubies and diamonds; a cabochon emerald is used for the eye. The detachable fitting allows the charming jewel to be worn as a hair ornament. "Versatile jewels, which were so popular in the distant past, are coming back into fashion," says Katherine Purcell of Wartski, the gallery selling the brooch. "Why have one jewel that you can use only one way?" Price upon request.