Yes. Apparently, these don't 'detract' from our uniform, but earrings larger than a 1/4" posts aren't allowed. Nail polish and hair color and eyewear have to be according to local management and you will be challenged about these! You can't wear lanyards of your favorite sports team, or anything that is not TSA issued uniform.
Answered - Lead Transportation Screening Officer (Current Employee) - Burbank, CA
Yes you can have them visible
Answered - TSO (Current Employee) - Miami, FL