The Dior Diorama Thread

Hi everyone!
I recently purchased a black medium Diorama in grained leather and silver hardware pre-loved from a local boutique that is selling preloved bags. The bag is from 2018 and the leather is fine but the hardware from the chain has worn out partly and is red underneath :sad: is this common thing? Is there anything to do with it? I had no idea that this could happen to a bag. I have had multiple designer bags and never had this problem :sad:(
 
So many pink shades. Can you please help me with these. Are these old rose? Dusky pink? Rose powder?
 

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