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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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Oxford () is the county town and only city of Oxfordshire, England. In 2017, its population was recorded at 152,450. It is 56 miles (90 km) northwest of London, 64 miles (103 km) south of Birmingham and 24 miles (39 km) northwest of Reading.
The city is home to the University of Oxford, the oldest university in the English-speaking world, and has buildings in every style of English architecture from late Anglo-Saxon.
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