The Devil's Eye

The Devil's Eye is the world's biggest diamond and the main reason of Madame Medusa's ambition. She would do whatever it takes to get her hands on the diamond. It used to belong to pirates that buried their treasure in a cavern in Devil's Bayou. At the end of the film the Devil's Eye is donated to the Smithsonian Institute.

Seekers of it
Cthulhu (To steal it from Devil's Bayou)

Rydak (To use it to gain power)