pearl that is irregularly or oddly shaped. Pearl formation does not always occur in soft-tissue areas, where the expanding pearl sac grows regularly because it encounters no appreciable resistance. Pearl cysts are sometimes lodged in muscular tissue, for example, where, unable to overcome the resistance of tough muscle fibres, they assume irregular or unusual shapes.

Baroque pearls were highly prized by Renaissance jewelers, who saw them not as misshapen products of sea mollusks but rather as unique and exquisite natural forms. They were often used in pieces of jewelry to form the bodies of figures. A superb example is a piece from the 16th century known as the Canning Jewel (Victoria and Albert Museum, London), in which a large baroque pearl is used for the torso of a sea figure having the body of a man and the tail of a fish, the whole mounted in enameled gold set with pearls, rubies, and diamonds. See also pearl.