Cultured pearl is calcium carbonate and a fibrous protein called conchiolin. As the nacre builds up in layers of minute aragonite tablets, it fills the growing pearl sac and eventually forms a pearl. Natural pearls are formed by nature, more or less by chance. On the other hand, cultured pearls are human creations formed by inserting a tissue graft from a donor oyster, upon which a pearl sac forms, and the inner side precipitates calcium carbonate, in the form of nacre or "mother-of-pearl". The most popular and effective method for creating cultured pearls are made from the shells of freshwater river mussels
Palatinate Pearl Palatinate Pearl The Palatinate Pearl is a pearl, kept with, but distinct from the Crown Jewels of Bavaria. The pearl is unique insofar as it is one of only very few part black, part white pearls to occur naturally. The pearl is set between two diamond encrusted snakes, protruding from a bed of leaves, flanked by two flowers. While the exact origins of the pearl are unknown it first appears among the royal Crown Jewels of Bavaria, who were the ruling family of the Palatinate, which gaves its name to the pearl (and possibly its origin). Having traveled with its