Origin of Corals and Pearls?
The formation of a natural pearl begins when a foreign substance slips into the oyster between the mantle and the shell, which irritates the mantle. The oyster’s natural reaction is to cover up that irritant to protect itself. The mantle covers the irritant with layers of the same nacre substance that is used to create the shell. This eventually forms a pearl. So a pearl is a foreign substance covered with layers of nacre. Most pearls that we see in jewellery stores are nicely rounded objects, which are cherished as valuable ones. Not all pearls turn out so well. Some pearls form in an uneven shape — these are called baroque pearls. Pearls, as you’ve probably noticed, come in a variety of colors, including white, black, gray, red, blue and green. Most pearls can be found all over the world, but black pearls are indigenous to the South Pacific. Coral is a plant-like-shape formed by millions of unicellular creatures which live in the bottom of the sea and are called coelenterate (coelen
