Diamond Earrings for GF...Where do I start?

[nbake]

So I'm going to buy my girlfriend some diamonds studs for her birthday. I've gone to a few jewelers and I've decided I probably don't want anything bigger than 1/4 carat and don't want to spend more than 150 dollars (I suck at poker).

What do you guys recommend for a good buy? Do I check ebay out? I'm ready for any suggestions.

Thank you in advance for your help.

Nick