Many think erroneously that foreign matter such as sand grains stimulates production of Nacre. Oysters are constantly exposed to grains of sand and other minor irritants, but only when something gets stuck, like a piece of shell, bone, coral, or a parasite starts oysters that produce Nacre.
Its natural reaction is to cover it with layers of nacre-that irritates the same substance used to create shell – and it will eventually form a Pearl. As a gem is a foreign substance covered with layers of Nacre.
Most gems like we see in jewelry stores are nicely rounded, and it is also those which are the most valuable. Some gems are formed in an uneven shape and as you’ve probably noticed, they come in a variety of colors, including white, black, gray, red, blue and green.
Most pearls can be found all over the world, but the black pearls are native to the South Pacific.
Cultured pearls are created by the same process as natural pearls, but get a little human help from Pearl cultivation vessels. In freshwater cultured pearls, it is enough to cut into the mantle in order to induce the Nacre secretion that produces a gem – a foreign object do not need to be installed as in seawater cultured pearls.
Greek mythology proclaimed gems to be tears of joy from of the goddess Aphrodite.
Ancient Egyptians connected the beads with Isis, the goddess of healing and life.
Tribal Indians believed that pearls were tears from their gods.
An Arab legend tells that the dewdrops filled with Moonlight fell into the sea, was swallowed up by oysters, and created the precious gems.
Pearls are cultivated in a mollusk and often made into fashion jewelry, such as bracelets, necklaces, and more, when a foreign element has been implanted by human help.
Cultured Pearl is grown on farms, where thousands of molluscs implanted and nurtured during the 2-5 years required for a Pearl that evolve.
Up through the middle ages causative the growing demand on gems a falling stock in the seas which caused sea trials with the production of pearls, and in 1904 it succeeds Japanese Kokichi Mikimoto to elicit the first round cultured pearl.