This question comes up fairly frequently on the forum, and I can almost never recall anyone successfully finding the proper gold bezel for their watch. If you search, you will find that several people have had a new bezel fabricated. Alternatively, the watch can be used as a parts donor.
I think that the bezel may be solid gold. You may want to search for people who have used these services and ask them about pricing by PM. Or better yet, contact the case repair shop firsthand. Given the price of gold today, even a 14k bezel won't be cheap.