A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable.
In ancient Vedic texts, the pearl is born of the Earth’s waters and the heaven’s powers, fertilized by a flash of lightning. It’s considered to be the daughter of the Moon. In Western cultures, the pearl has astrological associations with the planet Venus. Like pearls, the goddess of love came from the sea.