There is one thing about Tiffany's that makes it far more appealing than any place I've looked, and that is their financing!! That is important if you would like a $10k ring and don't want to wait a year to a) pay down a credit card so you have $10k available b) wait a year to save up the money and pay cash. They have a great Tiffany Time Card or something - in our case they approved us for 40% down on our ring with 9 months INTEREST FREE. That is much better than 18% on some credit card or 90-day lay-away or financin as I have seen in other jewelry stores - it makes a BIG DIFFERENCE! I don't want to get my e-ring two days before my wedding!
Plus, if you live near a Tiffany's you could take your ring to get steam-cleaned every week if you want to, and the customer service is great so far.
I am trying very hard to decide between a .84 H VS1 round w/.32 pear sidestones in plat. at Tiffany's v. an estate Cartier 1.08 E VS2 w/.19 bead-set in plat. They are both beautiful, but the experience I've had in Tiffany's and the fact that they have the 9 month interest free financing makes the first ring that much more appealing.
Just something to think about, in case you don't have all the cash/credit at your fingertips. The sales experience I've had in Tiffany's has been the best so far, and I've worked in retail too, so I'm extremely picky. And you are buying into the mystique of their 150 year history, so of course you don't negotiate, just like you wouldn't at Yves Saint Laurent - even though you may be buying -as with a diamond - just a "commodity" like a black turtleneck. You have to look at the whole experience, it seems. I HATED haggling at Houston's big diamond shop, HATED all the sales people, and would have LOATHED getting my diamond from them and the atmosphere was not right to cultivate a relationship that would last. Tiffany's was not like that. But you have to go with what fits you the most, of course.
Just my twocents, from a relative newbie
Love Street