so I would like to get my wife diamond studs for her birthday next month. She has very small ears, and I don't have as much spare $ as I would like, so I am thinking small, somewhere around 1/2 to 1/3 ctw. what should I look for in terms of color, clarity? I know the recommendations are different than for rings. I would like somewhere with a good upgrade policy in case she wants to go bigger one day. any suggestions where to start and what to look for?