i checked out blue niles before too
but i'm still a bit hesitant to buy such an expensive item over the internet...
i didnt choose tiffany because it is too over rated and too expensive for what it is
i ended up going to spence on burrard. great service and bought my ring there!
Always think that Tiffany is over priced a lot, well, if u are rich and don't mine paid more, girls usually surely like Tiffany rings.
I know a lot of guys usually do some "study" (learn online) about diamond before going out to buy since most of us doesn't know much before hand.
something like the basic: http://www.diamondmanufacturer.com/tutorial/howto.html