i need a chanel jewelery expert

I have a quantity of Chanel jewellery that I have accumulated from auctions etc and need someone who is an expert to tell me if any pieces have value and if they are authentic. I have done standard checks, hallmark stamps etc, many of them do not have, but many of them do have similarities to authentic Chanel jewellery, eg earring backs etc seem authentic and original. I need someone to sift through what I have and identify if any are authentic.