Have your rings appraised and then sell them on Craigslist. Make sure that you get the appraisal in writing so that you can give to the buyer to guarantee that the rings are real. Also meet in a public place to sell therings. I would meet at a jewelry store in a mall.
The jeweler can then verify the rings are real and you are in a safe environment.
You will get more $ selling them this way than to a jeweler or pawn shop.
Ginny