Found A Crab Pearl!
So we were eating at a steak house and my mom ordered some crab legs... she was eating away and bit into what seemed like a pearl. we had no idea what it was and neither did the staff of the restaurant. Unfortunately they threw it out, but since we were curious we researched it and found this. Matches the same description as some of the others... hard, pearl like, bluish in color, but not a circle, more of an oval shape... interesting stuff
the manager is digging through garbage now trying to find it for my mom :/