The New Hampshire courts have held that the basis for a donor’s recovery of an engagement ring from the donee who terminates the engagement is quasi-contractual and it is considered that it is unjust for a donee to retain the fruit of a broken promise.[1]  Restatement, Restitution § 58 allows the recovery of an engagement ring where the engagement is terminated by the donee.  Moreover, miscellaneous gifts of personal property other than the engagement ring are considered incidental to the marital quest, and recovery is not usually expected.

[1] Gikas v. Nicholis, 96 N.H. 177 (N.H. 1950)