Hi Alice! :-)
That's an excellent question, btw. Although I tend to use fairly pricey components, once in a while I use something outrageously expensive... and then I wonder the same thing.
I recently blogged about the subject of pricing (Tuesday, August 12, 2008; http://laurabrackenblog.blogspot.com).
In this particular instance, I think I'd try sticking to my formula. You can always adjust down later.
Remember, jewelry is a luxury item so trying to give the common man the best deal based on a sucky economy usually means we (the jewelry makers) end up doing nothing but selling out creations as a set of components. Ick! As hard as it is, we must NOT sell just to replace the cost of materials. If you're like me, you DO struggle with the whole "pricing game".
I'd love to hear how this turns out or what you end up deciding to do.
:-)