Pearl vs Maastricht

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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

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Maastricht (, also US: , Dutch: [maːˈstrɪxt] (listen); Limburgish (incl. Maastrichtian): Mestreech [məˈstʀeˑx]; French: Maestricht (archaic); Spanish: Mastrique (archaic)) is a city and a municipality in the southeastern Netherlands. It is the capital and largest city of the province of Limburg. Maastricht is located on both sides of the Meuse (Dutch: Maas), at the point where the Jeker joins it. It is adjacent to the border with Belgium. Maastricht developed from a Roman settlement (Trajectum ad Mosam) to a medieval religious centre. In the 16th century it became a garrison town and in the 19th century an early industrial city. Today, the city is a thriving cultural and regional hub.

It became well known through the Maastricht Treaty and as the birthplace of the euro. Maastricht has 1677 national heritage buildings (Rijksmonumenten), the second highest number in the Netherlands, after Amsterdam. The city is visited by tourists for shopping and recreation, and has a large international student population. Maastricht is a member of the Most Ancient European Towns Network and is part of the Meuse-Rhine Euroregion, which includes the nearby German and Belgian cities of Aachen, Eupen, Hasselt, Liège, and Tongeren. The Meuse-Rhine Euroregion is a metropolis with a population of about 3.9 million with several international universities.

Source: Wikipedia