Changchun Book Club- The Diamond as big as the Ritz by F Scott Fitzgerald

John T. Unger, a teenager from the Mississippi River town of Hades, is sent to a private boarding school near Boston. During the summer he visits the homes of his classmates, the majority of whom are from wealthy families.
In the middle of his sophomore year, a young man named Percy Washington is placed in Unger's dorm. He rarely speaks, and when he does, it is only to Unger. Percy invites Unger to his home for the summer, the location of which he only states as being "in the West". Unger accepts.
During the train ride Percy boasts that his father is "by far the richest man in the world", and, when challenged by Unger, boasts that his father "has a diamond bigger than the Ritz-Carlton Hotel."