The name comes from the Latin word  ‘Perla’ meaning teardrop shape.
In Greek it was called 'Margareeta', in Japanese "Shinju"
and in Sanskrit "Moti"

 Finest quality natural pearls have been always highly valued as gemstones and objects of beauty for many centuries, becoming a metaphor for the very rare, fine, admirable, and valuable things.

The wonderful natural pearls are formed when a foreign body enters inside the mollusk and it reacts slowly covering it of nacre, forming the pearl.

A  Persian classical poet in his work  Golshir-e Raz writes;

What is that sea whose shore is speech?
What about the pearl found in their depths?

Being is the sea, the shore is the speech,
the shell is the calligraphy and the pearl the heart of knowledge.

(Shabestari 1978, vv. 562-3, p. 56)

Its sensual and feminine  iridescent presence vibrates with the scent of Sage, yes, Common Sage.

The pearl gemstone adorns the seventh Chakra "Sahasrara"

It corresponds to the astrological sign of Cancer