"This Diamond Ring" is a 1965 song written by Al Kooper, Bob Brass and Irwin Levine.
It was first recorded by Sammy Ambrose on Musicor #1061, then by Gary Lewis & the Playboys on Liberty #55756.

Lewis' version charted first, #101 on the January 2, 1965, Billboard "Bubbling Under" chart. Both versions charted on January 9, Lewis still at #101 and Ambrose at #117.

Ambrose dropped off the charts at that point, but Lewis made #65 on the Billboard Hot 100 chart the next week (January 16) and his version continued to climb until it reached #1 on February 20, 1965.