The emerald and diamond engagement ring of Jacqueline Kennedy sits atop the initialed humidor belonging to late husband and former President John F. Kennedy at the John F. Kennedy library and museum, Thursday, Sept. 10, 1999, in Boston. The items are part of the JFK library exhibit "Treasure of the John F. Kennedy Library," which will run Oct. 9 through May 1, 2000. (AP Photo/Charles Krupa)