It is possible, but I've never had anything done. (Thought about it for an old razor, but decided I wasn't that sentimental about it.) Here's a place in Milwaukee that does electroplating. http://www.artisticplating.net/ definitely in the "don't try this at home boys and girls," as gold plating involves some sort of cyanide bath as I understand it. The other problem IIRC is that you end up with a pretty thin layer of gold, so you quickly end up right back where you started, or sometimes worse.
There are a couple of people on this thread who should know better than me about this, so I hope they'll correct anything I said wrong or anything I don't know about. I really hope they will if they can tell me that there is a reasonably priced reasonable quality way of doing this on small gold plated objects.