Not on my diamond, but I did get a ring covered in CA glue.
I used to work at a company that used it alot. I was repairing a doll's head and talking to the cute engineering intern and didn't pay attention to what I was doing and super glued my hand inside the head. I didn't tell the guy, and did eventually get my hand out but it too a while. My boss gave me a really hard time about it, but didn't tell my dad (he was also working at the company at the time and didn't think much of "cute engineering intern", lol)