Pearl or parasite enters a bivalve mollusk and settles inside the shell. The mollusk, irritated by the intruder, forms a pearl sac of external mantle tissue cells and secretes the calcium carbonate and conchiolin to cover the irritant. This secretion process is repeated many times, thus producing a pearl. Natural pearls come in many shapes, with perfectly round ones being comparatively rare. Typically, the build-up of a natural pearl consists of a brown central zone formed by columnar calcium carbonate (usually calcite, sometimes columnar aragonite) and a yellowish to white outer zone consisting of nacre (tabular aragonite). In a pearl cross-section
Pearl (given name) Pearl (given name) Pearl is a primarily feminine given name derived from the English word "pearl," a hard, roundish object produced within the soft tissue of a living, shelled mollusk. Pearls are commonly used in jewelry-making. The pearl is the birthstone for the month of June. Pearls have been associated with innocence and modesty. Because it comes from the sea, it also has associations with the moon and with water. Pearls are also traditionally considered appropriate jewelry for debutantes and brides. Pearl came into popular use along with other gemstone names during the late Victorian Era. It may also have