Some believed pearls to be the tears of the gods. Others thought them dewdrops filled with moonlight that fell into the ocean and were swallowed by oysters.
A pearl is a natural gem created by a living organism. When a foreign object is introduced into a mussel or oyster the animal coats the irritant with a substance called nacre, the same material with which it builds it’s shell. Layers of nacre build up to make a pearl.