Noun

Singular diamond ring

Plural diamond rings

diamond ring (plural diamond rings)

1. A finger ring on which is mounted a diamond, often a symbol of engagement or marriage.
   • 1907, Recreation, National Recreation Association, page 545

     If that mocking bird don't sing

     Daddy's going to buy me a diamond ring.

     If that diamond ring don’t shine

     Daddy’s going to buy me a bottle of wine.