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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.
Porvoo | |
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Population | 49459 |
Porvoo (Finnish pronunciation: [ˈporʋoː]; Swedish: Borgå [ˈborːɡo] (listen); Latin: Borgoa) is a city and a municipality situated on the southern coast of Finland about 35 kilometres (22 mi) east of the city border of Helsinki and approximately 50 kilometres (30 mi) of the city centre. It is one of the six medieval towns in Finland, first mentioned as a city in texts from the 14th century. Porvoo is the seat of the Swedish-speaking Diocese of Borgå of the Evangelical Lutheran Church of Finland.
The Porvoo Old Town is a popular tourist destination, known for its well-preserved 18th and 19th century buildings and 15th century cathedral, the Porvoo Cathedral.
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