Thanks for all of your input
After a second trip to the jewelry counter today, I don't know if matching will even be an issue at all. I felt my heart flutter when I put on a set that I had looked at the other day. It's somewhere between 1/3 and 3/8 total carat weight and sparkles like a star in the sky. It looks a lot like this:

It would match hubby's rather well if I do say so myself

I borrowed the ring pics from aafes.com. I couldn't find anything telling me not to use them so please don't sue me nice government peoples.