Hello everybody,
I buy this watch Last years (i am french).

I love this model but i find littles area who the yellow 750 gold turn To yellow-pink. Maybe the cause is the friction?

All of jelewery Shop where i went said this is gold but i dont have any response of this "phénomène ". This is a standard Tissot gold case use on lot of Tissot Carson model.

Can you help me please :)