Coyote Diamond
Coyote Diamond is the world's largest diamond, known for its flawless surfaces and clarity.
History
Fox sent Jackal and Hyena to steal the Coyote Diamond from the Diamond Exchange in 1994. However, Xanatos bought it before they could steal it, saying it would go nicely with the Star of Arabia. Xanatos' purchase of the Coyote Diamond prompted Jackal and Hyena to attempt to steal it from him and led to their attempted assassination of him at Xanadu. (In fact, Fox really sent Jackal and Hyena after the Coyote Diamond as part of Xanatos's scheme to recruit Derek Maza to his cause). ("Her Brother's Keeper")
Two years later, Xanatos would incorporate the diamond into the body of Coyote 5.0, though it isn't clear why yet. ("The Rock")