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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.
Guangzhou City | |
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Guangzhou (; simplified Chinese: 广州; traditional Chinese: 廣州, Cantonese pronunciation: [kʷɔ̌ːŋ.tsɐ̂u] or [kʷɔ̌ːŋ.tsɐ́u] (listen); Mandarin pronunciation: [kwàŋ.ʈʂóu] (listen)), also known as Canton and formerly romanized as Kwangchow, is the capital and most populous city of the province of Guangdong in southern China. On the Pearl River about 120 km (75 mi) north-northwest of Hong Kong and 145 km (90 mi) north of Macau, Guangzhou has a history of over 2,200 years and was a major terminus of the maritime Silk Road, and continues to serve as a major port and transportation hub, as well as one of China's three largest cities.Guangzhou is at the heart of the most-populous built-up metropolitan area in mainland China, which extends into the neighboring cities of Foshan, Dongguan, Zhongshan and Shenzhen, forming one of the largest urban agglomerations on Earth, the Pearl River Delta Economic Zone. Administratively, the city holds subprovincial status and is one of China's nine National Central Cities. At the end of 2018, the population of the city's expansive administrative area was estimated at 14,904,400 by city authorities, up 3.8% from the previous year. Guangzhou is highly ranked as an Alpha- (global first-tier) city together with San Francisco (the U.S) and Stockholm (Sweden). Guangzhou also ranks 21st globally (between Washington, D.C. and Amsterdam) and 8th in Asia (behind Shanghai, Tokyo, Hong Kong, Singapore, Beijing, Shenzhen and Dubai) in the 2020 Global Financial Centers Index (GFCI). There is a rapidly increasing number of foreign temporary residents and immigrants from Southeast Asia, the Middle East, Eastern Europe and Africa.
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