A half carat per ear is perfect. It's what I have and I never feel like they are too big to wear with jeans. I also like that I can wear them at work and no one needs to know what my hubby makes! The boss doesn't need to know that I want that raise for purses and not food!
Good for you! Every girl should treat herself and a pair of diamond studs is the way to go! i think diamond studs are a neccesity, it goes with everything.