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A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable.
The most valuable pearls occur spontaneously in the wild, but are extremely rare. These wild pearls are referred to as natural pearls. Cultured or farmed pearls from pearl oysters and freshwater mussels make up the majority of those currently sold.
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Raleigh (; RAH-lee) is the capital of the state of North Carolina and the seat of Wake County in the United States. Raleigh is the second-largest city in the state, after Charlotte. Raleigh is known as the "City of Oaks" for its many oak trees, which line the streets in the heart of the city. The city covers a land area of 142.8 square miles (370 km2). The U.S. Census Bureau estimated the city's population as 474,069 as of July 1, 2019. It is one of the fastest-growing cities in the country. The city of Raleigh is named after Walter Raleigh, who established the lost Roanoke Colony in present-day Dare County.
Raleigh is home to North Carolina State University (NCSU) and is part of Research Triangle Park (RTP), together with Durham (home of Duke University and North Carolina Central University) and Chapel Hill (home of the University of North Carolina at Chapel Hill). The "Triangle" nickname originated after the 1959 creation of the Research Triangle Park, located in Durham and Wake counties, among the three cities and their universities. The Research Triangle region encompasses the U.S. Census Bureau's Raleigh-Durham-Chapel Hill Combined Statistical Area (CSA), which had an estimated population of 2,037,430 in 2013. The Raleigh metropolitan statistical area had an estimated population of 1,214,516 in 2013.
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