Diamond ring or This Diamond Ring may refer to:

• Diamond ring, a type of Jewellery. For this usage, see also engagement ring.
• This Diamond Ring, a 1965 pop song written by Al Kooper, Bob Brass and Irwin Levine, and attributed to Gary Lewis and the Playboys
• “Diamond Ring”, a song by Bon Jovi from their 1995 album These Days
• “Diamond Ring”, a song by Pedro the Lion from the 1999 EP The Only Reason I Feel Secure
• “The Diamond Ring”, a song by Adair from their 2006 album The Destruction of Everything is the Beginning of Something New
• “This Diamond Ring”, episode #5.19 of Dharma & Greg featuring Claudia Schiffer as Gretchen