Pearl vs Pirassununga

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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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Pirassununga is a municipality in the state of São Paulo in Brazil, with an altitude of 627 meters. The population is 74,587 (2015 est.) in an area of 727 km².Situated in the southeast region of Brazil, the city is home to many important institutions, one being the Brazilian Air Force Academy. All current and future officers of the Brazilian Air Force are trained here. Pirassununga is also home to Fort Anhaguera, which once hosted the 13th Mechanized Cavalry Regiment of the Brazilian army. In addition to being an important region for the Brazilian military, Pirassununga is a hub for the agriculture and environmental sciences of Brazil.

The University of São Paulo's Faculdade de Zooteecnia e Engenharia de Alimentos (FZEA), which translates to the College of Animal Science and Food Engineering, is located in the city. Pirassununga is also the location of CEPTA, the National Research and Conservation Center of Continental Aquatic Biodiversity, which is associated with the Chico Mendes Institute, an important research and conservation center in Brasília, the capital of Brazil.

Source: Wikipedia