Pearl vs Nanchang

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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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Nanchang is the capital and largest city of Jiangxi Province, People's Republic of China. As of November 2017, the total population in Nanchang City was 5,246,600, while the built-up (or metro) area made of 6 urban districts plus Nanchang county is home to more than 4,300,000 inhabitants. Located in the north-central part of the province and in the hinterland of Poyang Lake Plain, it is bounded on the west by the Jiuling Mountains, and on the east by Poyang Lake. Because of its strategic location connecting the prosperous East and South China, it has become a major railway hub in Southern China in recent decades. As the Nanchang Uprising in 1927 is distinctively recognized by the ruling Communist Party as "firing the first gunshot against the evil Nationalists", the current government has therefore named the city since 1949 "the City of Heroes", "the place where the People's Liberation Army was born", and the most widely known "place where the military banner of the People's Liberation Army was first raised".

Nanchang is also a major city, appearing among the top 200 cities in the world by scientific research outputs, as tracked by the Nature Index and home to Nanchang University, the key national university of “Project 211” in the city.

Source: Wikipedia