yea just bc someone goes out and buys something expensive doesnt mean thats what the girl is going to expect from then on…and if she does thens shes a greedy bitch.
anyways. personally i do think earings are a bit lame BUT everyones got different tastes, so if earings are something that she likes then they would make a great gift for her. everyone has given alot of great places to look so your gf should be very happy with whatever you pick for her 
. good luck!