I just returned from Tiffany Singapore. The lady mentioned that my bracelet was "yellow gold". So when I said it's not, she said it's normal for rose gold to fade to its base colour, which is yellow, since 75% of the alloy is yellow gold. More so especially it's worn daily (though never into the swimming pool). I could send it for "polishing", which will bring it back to 98% like new - remove scratches and revived to rose gold, but that would cost S$150! (~ US$120). She said tiffany never does polishing for free.
Then I went to another attendant, in the same shop. After checking out the servicing catalogue, she quoted S$80 for my 2 pieces (bracelet + charm).
I'm now back home to square one. Still contemplating, as the same will still happen eventually since I wear it everyday. Well, at least the sales persons were curteous
I ogled at those pretty rebedo metal collection. They've mentioned that the colour would fade, too, and the main base is silver. It won't turn totally silver, though....
Now this is food for thought for all of us jewellery suckers out there - think of what occasion we'd want to wear the piece. If it's everyday wear, it's best to get white gold or platinum. IMO, don't buy silver from tiffany. It's overpriced.