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 it. It used to belong to pirates that buried their treasure in a cavern in Devil's Bayou. Bianca and Bernard help Penny retrieve it from a skull before the cavern gets flooded. Madame Medusa then hides it inside Penny's Teddy Bear with the intention of smuggling it out of the bayou. At the end of the film, it is donated to the Smithsonian Institute.