Amethyst Cufflink

Amethyst Cufflink is a treasure in Uncharted 3: Drake's Deception. It is found in Cruisin' for a Bruisin'.

After the big firefight in the main hall, you will sneak through the innards of the ship, taking out guards while being blinded by spotlights. You will go down a set of metal stairs. Rather than turning right into the red hallway, walk around to the back of the stairs. The treasure will be under the stairs.