Pearl is a biogenic mineral material, typically composed of calcium carbonate ($\text{CaCO}_3$), often crystallized in the aragonite structure. Its formation process involves the deposition of nacreous layers by certain marine mollusks in response to an irritant stimulus. These layers are formed through the secretion of various organic matrices and crystalline calcium carbonate, resulting in a highly iridescent and durable material. The structural arrangement of the nacre provides both exceptional luster and mechanical strength, leading to its use in various scientific, aesthetic, and industrial applications that study biomineralization.