California Landlord wants $500 from our deposit for this?!

[Ay Zed]

1. landlord did not call this discolored ring out during initial inspection, even though it was there and our belongings were not in the way, he did not leave us a list to be fixed

2. after we moved out, he did a final inspection, and wants to take $500 from our deposit for this ring. so we aren't given a chance as required by law to fix this ourselves

Landlords & realtors, what do y'all think? 

(btw, he also called out a couple other damages, but fortunately, I had move-in photos with dates to prove that those damages were there before we moved in)