I have a medium Marmont flap bag, and I noticed the gold is wearing off of the GG. Is there anything that can be done about this? I bought the bag pre-loved (but authenticated by two separate services), so, from what I understand, it’s unlikely I can get service by bringing into a store since I don’t have proof of purchase. I don’t know if there’s something I can do myself (doubtful, I know) or perhaps a bag spa/restoration company that can do something? Any ideas?