Chanel 521 Rose Cache was from 2011 fall or Christmas collection (anyway, late 2011).
I didn't really expect to love this color given it looks rather generic in the bottle, like any Chanel soft pinks.
It's a muted pink on a very slight mauve side, but not really "purple based" just yet. It's a soft creme finish, infused with very very fine shimmers that are barely visible on the nails, (however my very last picture below picks up the shimmers under flash photography if you look close).
The shimmers are more obvious in the bottle than on the nails.
It's sort of still translucent creme, that builds to a good opacity (consider this is still a light pink) with 2 coats.
First pic below is with ONE coat. I'm wearing Paul & Joe base coat underneath which is pretty much clear anyway.
Below are done with two coats. From a distance it's very pretty and elegant- I wore this to a wedding with a white and multi-color print dress on the weekend. It's understated but I would still think it's a unique pink.
Pic below shows as much mauve tone as you can get out of this.
This pic below picks up the shimmers on my middle and index finger a bit more at an angle.
I cannot think of anything else in my collection that looks similar.
Out of all the recent Chanel soft pinks I'm quite liking this one for its uniqueness with the very light mauve tone base.
Overall 5/5. It has an usual Chanel polish consistency, sometimes I do find it chips faster than e.g. OPI nail polishes.