London Blue Topaz -- with color so deep you could go swimming in them.

Well cut, with lots of crazy sparkle, these stones are set into a simple 14k Post Earring Mounting, allowing the most show of stone for the least expense in gold.  It's a good stable setting that doesn't set you back a month just to get one. 

There's no reason why these stone shouldn't last you for years, and dazzle every day of it.