Provide a detailed description of pearl harvesting, the grading process, and the economics of pearl culture.

Pearl harvesting is a meticulous process involving the cultivation and collection of pearls from mollusks, primarily oysters and mussels. The procedure is integral to coastal aquaculture and demands precision, patience, and expertise.

Pearl Harvesting Process

Pearl harvesting begins with the insertion of a nucleus, typically a small bead or piece of mantle tissue, into the mollusk. This process, known as nucleation, stimulates the mollusk to secrete layers of nacre around the nucleus, forming a pearl. The oysters or mussels are then carefully cultured in controlled aquatic environments, either in the sea or in specially designed hatcheries.

The mollusks are monitored over a period of 6 months to 3 years, depending on the desired size and quality of the pearl. Once the pearls are ready, harvesting is performed by carefully opening the mollusks without causing unnecessary harm. The pearl is extracted, _______ _________ ______ ______ ________.
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