Pearl vs Oldham

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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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Oldham is a large town in Greater Manchester, England, amid the Pennines and between the rivers Irk and Medlock, 5.3 miles (8.5 km) southeast of Rochdale and 6.9 miles (11.1 km) northeast of Manchester. It is the administrative centre of the Metropolitan Borough of Oldham, which had a population of 230,800 in 2015. Historically in Lancashire, and with little early history to speak of, Oldham rose to prominence in the 19th century as an international centre of textile manufacture. It was a boomtown of the Industrial Revolution, and among the first ever industrialised towns, rapidly becoming "one of the most important centres of cotton and textile industries in England". At its zenith, it was the most productive cotton spinning mill town in the world, producing more cotton than France and Germany combined.

Oldham's textile industry fell into decline in the mid-20th century; the town's last mill closed in 1998. The demise of textile processing in Oldham depressed and heavily affected the local economy. Today Oldham is a predominantly residential town, and the improvement of the town centre is the focus of a project for transforming Oldham into a centre for further education and the performing arts. It is, however, still distinguished architecturally by the surviving cotton mills and other buildings associated with that industry. As of 2001, the town had a population of 103,544 and an area of around 26 square miles (67 km2).

Source: Wikipedia