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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.
Santa Cruz do Sul | |
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Santa Cruz do Sul (pronunciation ) is a city in central Rio Grande do Sul, Brazil. The city has an estimate 130,000 inhabitants as of 2019 and sits about 150 km (93 miles) from the capital city of the state, Porto Alegre.
Sales are activities related to selling or the number of goods sold in a given targeted time...
's-Hertogenbosch (UK: , US: , Dutch: [ˌsɛrtoːɣə(m)ˈbɔs] (listen); French: Bois-le-Duc [bwɑ l(ə)...
Araguari is a municipality in western Minas Gerais state, Brazil. It is in the northern Triângulo...