It's kind of unclear if that includes the chain or not, but for $2.50 and free shipping, who cares?
There are these FUN earrings , but no crystals involved. They look like something my hippy-dippy sister would like, though. They come in different designs, and they're only $4.39 with $0.60 for shipping.
Here's another pendant that has an amethyst in it. It's $5.32 and free shipping with prime.