The Emerald Wheel is treasure that can be obtained in Sly Cooper: Age of Thieves in the episode Coopers of the Caribbean. It is worth 256 coins and the time needed to reach the safehouse is forty-one seconds.
"This beautiful helm was once a part of Davy Jones' ship before it sank some time ago. Crafted with a big emerald in its center, this piece of wreckage is definitely a marvel to have on display in any hideout."
It is located on the very top of the island. Sly's Buccaneer Costume is required in order to reach it.