Turns out it was not a chip. It was...super glue! Guess when I was handling my project this morning there must have been a bit of glue still moist on it somewhere, and it got on my ring. I just happened to notice it after I wonked it against the wall. God I'm so relieved...
It really looked and felt like a chip though, it had a groove in it. That is, the glob of glue had a groove in it, hah.