Hi, I am still confused.. The two ladies who's charms had tarnished have been re- polished by me and returned. They haven't worn them in the shower again and seem to be fine now.
I had another customer today though, I only delivered her necklace last night and this morning it is tarnished. She hasn't showered in it but wore it over night.
I can fully accept that silver tarnishes but this seems to be happening really quickly and it's worrying that it's happened to more than one customer