I know my ring is real 14k gold and I have another ring that I wore for years that is sterling silver. Never had any issue until these last few months. My fingers turn blackish where the rings are. I always thought fake jewelry will turn skin colors green, but not 14k gold or silver. Anyone know what the deal is? It come off as soon as I wash my hand, but I have to take my ring off and wash my hand several times a day to keep from looking dirty. So annoying!!