No personal offense intended to you, but diamonds are for suckers. Sure you can tell the difference between a diamond and other stones, but which looks better? Definitely not the diamond. Don't get screwed by a monopoly that tries to tell you what you need to do or want.
I got my fiance the following:
http://titaniumera.com/detail.php?product=140&locale=1
And you know what? You can spend whatever you were just planning to spend on a diamond and still not get a stone that is as visually enjoyable in the light. Get a CZ and spend the extra money on workmanship and engraving for the setting.