f0461dd7_Pearl_Types___AJU__Description
[Pearl Type] Natural [Description] 
Natural pearls form by chance when an irritant enters a mollusk and sticks between the shell and mantle. Mantle tissue forms over the intrusion forming a pearl sac. Calcium carbonate crystallizing as aragonite, bound by conchiolin, is secreted by the mantel and deposited in layers over the irritant. The thicker the nacre the more lustrous the pearl. Natural pearls are very rare today. Sometimes referred to as fine, wild or oriental pearls.
Pearl Types - AJU