baby blues

I'm terribly tempted by those pictures posted of Richard Homer's lovely work. Since, at least for the summer, I'm not so terribly underpaid, I thought perhaps I might be able to afford a small pendant.

I've found a few cuts that I like (the concave pentagon, maple leaf (marrying a Canadian, what can I say), and snowflake), but what I don't know is what stones come in blue. Since it's a pendant, I don't see it getting beat up, but I do want to wear it on a nearly-daily basis. (Except for earrings and a few bead necklaces, I tend to have one of everything, and wear it all the time -- one ring, one watch)

I love all sort of blue, but I'm looking specifically for something that has sufficient contrast with black (because I wear a lot of black -- it always matches!), so I'm looking for something in the lighter shades. What type of stones should I be looking for? Does anyone have any preferences among those cuts? Note that price is a consideration, I'd prefer not to go /too/ expensive, since I'm still a student, even if I'm temporarily a reasonably-paid student...

Thanks so much