An irritant such as a bead, grain of sand, or piece of mantle tissue is inserted by human intervention into the body of a mollusk, and becomes the nucleus of a pearl once that mollusk secretes nacre to cover the irritation.
Other Database Pages Exist for this Phrase:
Cult (Cult refers to (also called new religious ...)
Bead (Bead is described as the stationary platen of a ...)
Gemstone (Gemstone (Gem) is described as precious or ...)
List of books: Cultured,pearl