Is the mother sinful for not returning the engagement ring that the fiancé gave her after the engagement was broken, especially since she sold it?

If the suitor gives a ring to his fiancée's mother as a mere gift, he is not entitled to take it back, even if the engagement is broken off and the marriage does not take place. However, if the ring was given as part of the dowry, whether by custom or agreement, and the engagement is broken off, its value must be returned to him if the mother has disposed of it; this is because the dowry is not finalized until the marriage contract is concluded.