Pearl vs Stralsund

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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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Stralsund (German pronunciation: [ˈʃtʁaːlzʊnt]), Swedish: Strålsund) is a Hanseatic city in the Pomeranian part of Mecklenburg-Vorpommern, Germany. It is located at the southern coast of the Strelasund, a sound of the Baltic Sea separating the island of Rügen from the mainland.The Strelasund Crossing with its two bridges and several ferry services connects Stralsund with Rügen. The Western Pomeranian city has been the capital of the Vorpommern-Rügen district since the 2011 district reforms. It is the fourth-largest city of Mecklenburg-Vorpommern and, together with Greifswald, Stralsund forms an Oberzentrum, one of four high-level urban centers of the region.

Stralsund was granted city rights in 1234 and was one of the most prospering members of the medieval Hanseatic League. In 1628, during the Thirty Years' War, the city came under Swedish rule and remained so until the upheavals of the Napoleonic Wars. From 1815 to 1945, Stralsund was part of Prussia. Since 2002, Stralsund's old town with its rich heritage is honored as a UNESCO World Heritage, along with Wismar in Mecklenburg. The main industries of Stralsund are shipyards, fishing, mechanical engineering, and, to an increasing degree, tourism, life sciences, services and high tech industries, especially information technology and biotechnology.

Source: Wikipedia