I understand, but as an umpire how do you handle tape, band-aids or other thinly-veiled attempts to cover up jewelry? I was taught years ago in my first officiating class and have continued to this day that you ask the coach if the players are legally uniformed and equipped. If he or she says that they are, then the responsibility is off of me and onto the coach. I was taught to not ask what is under band-aids or tape or to lift shirts and check for belly rings. We all "KNOW", but the coach has taken responsibility by making his or her certification. If the covering falls off or comes loose during play, then it is penalized according to the rules. I am just interested in how you handle this.
Lifting up shirts? No, never going to happen!
But if I see a kid with both of her ears taped up, I'm going to ask the coach what's going on. I'm going to remind him that taping over jewelry doesn't make it legal. I'm going to remind him that he's assured me his team is legally and properly equipped and if he's lying he could be ejected for unsportsmanlike conduct. And I'm going to remind him that in the case of an injury due to any jewelry the liability is now his.
What they do with that information is up to them. But if I see something that makes me think jewelry might be involved, I won't just ignore it.
And, no, I do not enjoy playing the fashion police on a ball field. I'm not going to go out of my way performing jewelry inspections, but believe that if we suspect it then we should address it, because it is not only a rule violation but a safety issue as well. There are even a couple of case plays on the books about a player having a ring or necklace covered with tape and the umpire addressing it.