Have you ever wondered what happens if you take a hydrogen fueled torch and try setting pearls on fire? Me neither, but youtuber "CarsandWater"
clearly thinks a little different then you or I. In the video below he shows what happens when you spend 4 1/2 minutes torching a pearl. From the video we can see there layer after layer of calcium carbonate peeling away until nothing is left, indicating there was no nucleus in the pearl. I'm not exactly sure how useful this experiment is, but it sure looks cool!