A fisherman in the Philippines kept a giant pearl estimated to be worth a whopping $100 million under his bed for a decade.

The man was not aware of the pearl's value and had kept it as a good luck charm, until he shared his find with authorities after a fire forced him out of his home. 

Weighing 34kg and measuring 30cm wide and 67cm long, the giant gem is around five times bigger than the pearl previously considered the world's biggest, the Pearl of Lao Tzu. 

A tourism officer told the Daily Mail that the unnamed fisherman had found the pearl after his anchor had become lodged in its clam shell.

"He noticed that it was lodged on a shell and swam down to pull up the anchor, and also brought the shell with him. This was a decade ago and he kept it at home," said Aileen Cynthia Amurao

Authorities are waiting for expert gemologists to certify the pearl as genuine before officially proclaiming it as the world's largest.