I bought the size 5 ring, but it's actually not a standard size 5, fyi. I'm not sure if all the sizes run small, though. It's probably closer to a 4.25 (it's a smidge looser than my engagement ring, which was sized by 2 independent jewelers as a size 4). It actually ended up working out perfectly, but just thought I'd let you know that the sizing might not be standard sizing.

In any case, the ring is great--it was very thin, but I was expecting it to be. I haven't had problems with tarnish yet, but I haven't worn it every day.