You'll probably want to go with a Victorian era ring, since the gold alloys used then are sometimes quite rosy, and very beautiful, IMO. Start with that search criteria, and see where it takes you. There are a variety of sites that carry antique jewelry - I always recommend Lang Antiques for sheer quality and selection, but there are many others that may be lower priced. Ruby Lane is sort of an antiques ebay, but the pricing is generally closer to retail there, too. If you are looking for a deal, ebay is probably the best bet. Wherever you buy, be sure the seller has a great return policy, in case it's not "the one". Good luck in your search! It can be overwhelming, but a lot of fun, too.