I awakened the pearl clam that had been sleeping for a hundred years, and it brought me great wealth

By the way, did you know how a pearl forms? It happens when bacteria enters between the mantle and it's shell, many cells in the mantle secreates layers of calcium carbonate. It's keep doing this until bacteria can't escape. This is how clams, mussels, oysters, scallops, and other molluscs protect themselves from bacteria. To protect it's internal organs. The coating of calcium carbonate around the bacteria leads to a formation of a pearl!

 The fact that those clams were so big and had so many pearls inside means they must have been really old. It’s depressing to see you kill them so mercilessly 😢

WATCH

I awakened the pearl clam that had been sleeping for a hundred years, and it brought me great wealth

These are seeded oysters.  The "seed"  is called nuclei and most likely it comes from the Tennessee River in the United States.   Divers harvest mussel shells in the rivers in the eastern US and ship to Japan where they are cut and rounded to become the nuclei.  Then the Nuclei is implanted into the oyster and after a few years, the oyster coats the nuclei  with nacre.   Large pearls like this usually start with the Washboard mussel from Kentucky Lake in the Camden Tennessee area.

There’s an extraction method DIY without killing “ the hen of golden eggs” seen in YouTube,operation is on a table clams are put on position and using tongs pearls are extracted,clams put back on where they were found