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
Pearl Krabs vein to "Mother of God," as a reference to the absence of Pearl's mother. His use of the phrase only when he is dismayed or shocked has led some viewers to believe something tragic happened to Mrs. Krabs. At Dragon Con in 2016, Lori Alan and Rodger Bumpass addressed Pearl's origins as their characters Pearl and Squidward. In the skit, Squidward asks Pearl if she is adopted. Pearl does not give a definite response, instead saying that she gets emotional over the topic. Later at the same event, the actors discussed the disappearance of Pearl's mother. Alan affirmed that Mrs.