Found a pearl in King Crab legs on Valentine's Day

Not so interesting story.. my hubby was eating and lightly bit down on something hard. He pulled it out and it was a slightly rectangular "pearl" that came out of the meat on the crab leg. It was about the size of a split pea or so and white. It was pretty hard, and we figured maybe a small piece of sand or something was like an irritant and it slowly turned into a pearl, like regular pearls. I was hoping it was a lucky thing or something.. It was lucky he didn't bite down hard and his teeth were okay I guess. A valentine crab pearl. The crab was delicious, so we enjoyed it anyway..