[fred cook]

Pick a couple of jewlery stores and act as though shopping. Pick a nice piece of jewerly and in the conversation ask about "trading in" your ring. Do this a couple of times and you should have at least an estimate of the value. Keep in mind they won't allow a selling price value as they would expect to make a profit on your ring as well as on whatever you might trade on. My wife had some diamond rings appraised recently and found that they were worth much more than she thought! Good luck.