Pearl vs Soria

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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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Soria (Spanish pronunciation: [ˈsoɾja]) is a municipality and a Spanish city, located on the Douro river in the east of the autonomous community of Castile and León and capital of the province of Soria. Its population is 38,881 (INE, 2017), 43.7% of the provincial population. The municipality has a surface area of 271,77 km2, with a density of 144.97 inhabitants/km2. Situated at about 1065 metres above sea level, Soria is the second highest provincial capital in Spain. Although there are remains of settlements from the Iron Age and Celtiberian times, Soria itself enters history with its repopulation between 1109 and 1114, by the Aragonese king Alfonso I the Battler. A strategic enclave due to the struggles for territory between the kingdoms of Castile, Navarre and Aragon, Soria became part of Castile definitively in 1134, during the reign of Alfonso VII. In Soria was born Alfonso VIII, and Alfonso X had his court established when he received the offer to the throne of the Holy Roman Empire. In Soria, the deposed king James IV of Mallorca died, and John I of Castile married.

Booming during the Late Middle Ages thanks to its border location and its control over the bovine industry, Soria went into a slow decline over the next few centuries. It was seriously damaged during the Peninsular War. The city preserves an important architectural heritage (extensive medieval walls, Renaissance palaces and architecturally distinctive Romanesque churches) and is home to the Numantine Museum (with pieces from the nearby Celtiberian city of Numantia). Today, its population of 38,881 makes Soria the least populated provincial capital of Castile and León and the second least populated in Spain (after Teruel). Particularly important in its economy is the agri-food industry, while an increasing number of tourists are attracted by its cultural heritage. Soria was mentioned by UNESCO as a good example when including the Mediterranean diet in its Representative List of the Intangible Cultural Heritage of Humanity.

Source: Wikipedia