What are some of the Pennsylvania statutes that apply to my assigment

What are some of the Pennsylvania statutes that apply to my assigment

A salesman tells you that the diamond ring you want to purchase “is the best quality diamond he has in the entire store, and, in fact, is the best diamond he has ever seen”. After you buy the diamond, you discover that the diamond is a very low grade. Have you been defrauded? Why or why not?