Brussels vs Pearl

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The City of Brussels (French: Ville de Bruxelles [vil də bʁysɛl] or alternatively Bruxelles-Ville [bʁysɛl vil]; Dutch: Stad Brussel [stɑd ˈbrʏsəl] or Brussel-Stad) is the largest municipality and historic centre of the Brussels-Capital Region, and the capital of Belgium. Besides the strict centre, in addition, it covers the immediate northern outskirts where it borders municipalities in Flanders. It is the administrative center of the European Union, thus often dubbed, along with the area, the EU's capital city. The City of Brussels is a municipality composed of the central historic city and certain additional regions within the greater Brussels-Capital Region, namely Haren, Laeken and Neder-Over-Heembeek to the north, as well as Avenue Louise/Louizalaan and the Bois de la Cambre/Ter Kamerenbos park to the south.

As of 1 January 2017, the City of Brussels had a whole population of 176,545. The entire area is 32.61 km2 (12.59 sq mi) which gives a population density of 5,475 inhabitants per square kilometre (14,180/sq mi). As of 2007, there were approximately 50,000 registered non-Belgians in the City of Brussels. In common with all of Brussels' municipalities, it's legally bilingual (French--Dutch).

Source: Wikipedia

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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.

Imitation pearls are also widely sold in inexpensive jewelry, but the quality of their iridescence is usually very poor and is easily distinguished from that of genuine pearls. Pearls have been harvested and cultivated primarily for use in jewelry, but in the past were also used to adorn clothing. They have also been crushed and used in cosmetics, medicines and paint formulations. Whether wild or cultured, gem-quality pearls are almost always nacreous and iridescent, like the interior of the shell that produces them. However, almost all species of shelled mollusks are capable of producing pearls (technically "calcareous concretions") of lesser shine or less spherical shape. Although these may also be legitimately referred to as "pearls" by gemological labs and also under U.S. Federal Trade Commission rules, and are formed in the same way, most of them have no value except as curiosities.

Source: Wikipedia