In jewelry, the term Baroque is used to describe an irregularly shaped object. Most commonly it is used to describe a pearl that is asymmetrical. Cultured freshwater pearls are most commonly baroque, because freshwater pearls are mantle-tissue nucleated instead of bead nucleated. Thus these pearls are rarely perfectly spherical and can appear oval or ovoid. The most valuable of baroque pearls are the South Sea and Tahitian pearls. Although these are a variety of cultured saltwater pearls, the amount of time that the pearls are cultured dramatically increases the depth of the nacre, and the likelihood of producing a baroque pearl.