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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.
Pyongyang | |
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Population | 3871335 |
Pyongyang (US: , UK: , Korean: [pʰjʌŋ.jaŋ]) is the capital and largest city of North Korea. Pyongyang is located on the Taedong River about 109 kilometers (68 mi) upstream from its mouth on the Yellow Sea. According to the 2008 population census, it has a population of 3,255,288. Pyongyang is a directly-administered city (직할시; 直轄市; chikhalsi) with equal status to North Korean provinces.
Pyongyang is considered one of the oldest cities in Korea. It was the capital of two ancient Korean kingdoms, including Gojoseon and Goguryeo, and served as the secondary capital of Goryeo.
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