The Nine Jewel Ring is the thirty-first treasure that can be found in Uncharted 2: Among Thieves.
The Nine Jewel Ring is found in Chapter 7 - They're Coming With Us . The second of four treasures found throughout this chapter can be acquired as soon as the initial firefight is quelled. When things are quiet, head to the ornate fountain at the far side of the courtyard. In the middle of the fountain is a tall pillar, at the top of which is a statue and some other decorations. Hanging next to the statue, even higher, is some sort of bell. If you maneuver yourself so that you can see underneath the bell, you'll see the telltale glimmer of a treasure. Shoot it down with a weapon of your choice, and claim it on the ground before continuing.