The Tibetan Ritual Vase is the eighty-second treasure that can be found in Uncharted 2: Among Thieves.
The Tibetan Ritual Vase is found in Chapter 23 - Reunion. This treasure is easy to find, and is indeed almost impossible to miss. After the cutscene runs its course you'll regain control on the upper catwalk of the starting room. Work your way around to a wooden plank that seems to lead to a drop. However, in the distance you'll see a rope conveniently hanging. Carefully leap towards the rope, and Drake should grab on automatically. The angle at which you initially swing after jumping from the plank should lead directly to a treasure embedded in the pillar you're swinging at. Simply keep an eye for the treasure prompt to appear on-screen and quickly hit Triangle to claim the treasure before you swing away.