How much is your mens p4sr diamond ring worth?
Anything is worth whatever someone will pay you for it.
Take your jewelery to a jeweler, or a pawn broker and ask on
sight, what each will pay you for it. Otherwise, you can pay a
certified gemologist to quantify the characteristics of the
diamonds and the metal in the ring, in order to establish a fair
market value for it. This may help you sell it privately.