Atlantic City - For years, Atlantic City's pawn shops - euphemistically known as "cash for gold" stores - have served as magnets for tapped-out gamblers looking to hock their jewelry for one last shot at a casino jackpot. Now one gaming hall will allow its customers to trade in their rings, watches and other gold items without having to go to the pawnbrokers crowding Pacific Avenue, just steps from the Boardwalk casinos.