The Supreme Court of New York held that a donor could not recover an engagement ring upon donee's renouncing her intention to marry him, where the contract to marry was void since the donor was already married.
Lowe v. Quinn, 301 N.Y.S.2d 361 (Ist Dep't 1969).
William C. Costopoulos,
Domestic Relations - Gifts in Contemplation of Marriage,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol8/iss1/18