I'm not really into diamond jewelry but I really like these rings by Stephen Webster. They are incredibly well-designed and have a lot of fun with the theme. The lust one is the most creative, but the wrath one is the one I'd wear every day. Click for big. While you do that I'm going to go watch Se7en.
photo credit: http://themissive.tumblr.com/post/3200035136/seven-deadly-sins-by-stephen-webster-good