A letter opener by Carl Fabergé, Workmaster: Fedor Afanassiev, St. Petersburg, circa 1905. Photo courtesy Wartsky

cut from a single piece of nephrite and mounted on both sides of the handle with gold roubles from the reign of Katherine the Great enamelled translucent red over a concentrically engraved ground, within a cage of yellow gold rocaille and above chased gold flowers set with a brilliant cut diamonds. 15.8cm in length, 2.2 cm across. Price on application

Wartsky. http://www.wartski.com/