The Golden Skull of Koo Koo Diego is an old Mayan treasure. It was once the skull of Koo Koo Diego, but it was later covered with gold plating and a red gem was placed in it's left eye. The treasure is over 200 years old.
Donavin Conrad had the Skull in his possession because he wanted to take it to a pawn shop and get lots of money for it. But relic hunter Abbey Chase managed to take it from him while they were in Costa Rica.