Silver and Coral Ring

Silver and Coral Ring is a treasure in Uncharted 3: Drake's Deception found in As Above, So Below.

Climb down the ladder at the very start of the chapter. When you get to the bottom, instead of jumping down, climb round to the right. The treasure is on the other side of the ledge that you're hanging from. Can also be grabbed later in the chapter when climbing out of the well.