Pearl is an organic gemstone formed inside the shells of certain mollusks, such as oysters and mussels, as a natural defense against irritants—layers of nacre (mother-of-pearl) create its characteristic luster and iridescence. Available in colors like white, cream, pink, black, and golden, with the finest exhibiting a deep, mirror-like orient. Unlike other gems, pearls are not mined but harvested, and they are the traditional birthstone for June, symbolizing purity and wisdom for centuries.