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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.
Kelowna | |
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Population | 117312 |
Kelowna () is a city on Okanagan Lake in the Okanagan Valley in the southern interior of British Columbia, Canada. It serves as the head office of the Regional District of the Central Okanagan. The name Kelowna derives from an Okanagan language word for "grizzly bear".Kelowna is the province's third-largest metropolitan area (after Vancouver and Victoria), its seventh-largest city overall, and the largest in the Interior. It is the 22nd-largest city in Canada. The city proper encompasses 211.
Saint Petersburg (Russian: Санкт-Петербург, tr. Sankt-Peterburg, IPA: [ˈsankt pʲɪtʲɪrˈburk]...
Satu Mare (Romanian pronunciation: [ˈsatu ˈmare]; Hungarian: Szatmárnémeti [sɒtmaːrneːmɛti];...
Madrid (, Spanish: [maˈðɾið]) is the capital and most-populous city of Spain. The city has almost...