I'm of two minds about Tiffany's. The silver and everyday pieces are definately overpriced and cliche. When I see a tiffany bag on the street I think 'sucker!'. (and I'm not a very judgemental person)
BUT I have this small, private jeweler whom I buy from (the best option if you can find one) and she said something unexpected in our correspondence a couple of months ago. Now, she is VERY hard to please - she uses only F colored, perfectly cut diamonds and that's for accent stones. Her prices are high, of course, but sooo worth it.
Anyway after mentioning the machinations she's gone thru finding reliable, excellent sources of top quality stones she says 'really Tiffany has the best diamonds in mass market jewelers'. Tiffany???? Thunk. Now when she said 'mass market' I think she was excluding, you know, Harry Winston and even Chopard because they aren't as accessible. Tiffany's is everywhere by comparison. But still. The last thing I expected her to say.