Pearl vs Doncaster

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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.

Imitation pearls are also widely sold in inexpensive jewelry, but the quality of their iridescence is usually very poor and is easily distinguished from that of genuine pearls. Pearls have been harvested and cultivated primarily for use in jewelry, but in the past were also used to adorn clothing. They have also been crushed and used in cosmetics, medicines and paint formulations. Whether wild or cultured, gem-quality pearls are almost always nacreous and iridescent, like the interior of the shell that produces them. However, almost all species of shelled mollusks are capable of producing pearls (technically "calcareous concretions") of lesser shine or less spherical shape. Although these may also be legitimately referred to as "pearls" by gemological labs and also under U.S. Federal Trade Commission rules, and are formed in the same way, most of them have no value except as curiosities.

Source: Wikipedia

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Doncaster (, ) is a large minster and market town in South Yorkshire, England. Together with its surrounding suburbs and settlements, the town forms part of the Metropolitan Borough of Doncaster, which had a mid-2019 est. population of 311,890. The town itself has a population of 109,805. The Doncaster Urban Area had a population of 158,141 in 2011 and includes Doncaster and neighbouring small villages. Part of the West Riding of Yorkshire until 1974, Doncaster is about 17 miles (30 km) north-east of Sheffield, with which it is served by an international airport, Doncaster Sheffield Airport in Finningley.

Under the Local Government Act 1972, Doncaster was incorporated into a newly created metropolitan borough in 1974, itself incorporated with other nearby boroughs in the 1974 creation of the metropolitan county of South Yorkshire.

Source: Wikipedia