Thanks everyone -- I still like both pearls very much, but I think the pink one might be better colour wise... I never really wear yellow gold. Maybe I should start doing so, but it just feels weird to me!
The setting is the new Goddess collection ring setting -- I like it very much, because it's simple and it shows the pearl well. Anyway, I have asked Mia to see if she can find a few more similar pearls of that size before I make a decision. I will keep you all posted, and thanks again for weighing in; I really appreciate your input -- this will be my first pearl ring and I'm very excited about it.