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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.
Krasnodar | |
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Population | 1318142 |
Krasnodar (; Russian: Краснода́р, IPA: [krəsnɐˈdar]) is the largest city and the administrative centre of Krasnodar Krai. The city stands on the Kuban River in Southern Russia, with a population of 932,629 residents, up to 1 million residents in the urban agglomeration. Krasnodar is the sixteenth-largest city in Russia, and the second-largest city in Southern Russia, as well as the Southern Federal District.
The city originated in 1793 as a fortress built by the Cossacks, and became a trading center for southern Russia.
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