Abacus Pendant. That way she can keep track of all the sweet, gentlemanly things you do for her during the day. Like always walking between her and the street.
Geode Skull Pendant is a pretty awesome necklace. Just make sure you give it to a pretty awesome girl. It'd be wasted on anyone else. The fact that the skull is a Day of the Dead skull makes it even cooler.
Jade Pipe Pendant is my favorite. I've been in China/Asia for over two months now and haven't seen something as cool as this. This pendant is for the girl who can talk about Truffaut and The Hangover in the same sentence and wears five inch heels just as easily as Air Force Ones. Plus when you guys get bored, she could totally serenade you with it.
If you haven't, get over to SnoozerLoser NY.