Fine Jewelry Now

I was wondering what I should get my girlfriend for valentines day. We're both freshmen in college, and everything is going really well, and we both love each other deeply, but I'm not sure what I should get her.

I wasn't sure since it was our first valentines day if I should get her something like flowers and chocolate, or lingerie, or bath & body stuff. At first I was planning on getting her a diamond heart pendant, or something like that, but I wasn't sure if that would be setting the bar too high for the future, and I should wait to give expensive jewelry.

So if people could give me some idea of what sounds appropriate or give me links to some good gift ideas that would be wonderful. Money isn't too important, but probably under $200 total, unless it's really nice.

Thanks so much!