Pearls are formed when a piece of sand or other irritant finds its way into an oyster. The oyster begins to secrete a smooth hard crystalline substance called nacre around the irritant to protect itself. As long as the irritant remains, the oyster will continue to produce this nacre, layer upon layer. It will take several years to produce a 3 to 4mm pearl.
The Tahitian Pearl is an organic gem formed from the black lip oyster (Pinctada margaritifera). These pearls derive their name from the fact they are primarily cultivated around the islands of French Polynesia, around Tahiti. The most valuable of these are of the darker variety, as the naturally darer tones of the Tahitian pearls is a unique quality among pearls.
Some believe pearls give the wearer a sense of calmness and centeredness. Pearls promote faith, loyalty, truth and purity. They can especially enhance personal integrity and help with inspirational thought and wisdom.