Pearl vs Ribeirão Preto

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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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Ribeirão Preto (Portuguese pronunciation: [ʁibejˈɾɐ̃w ˈpɾetu]) is a municipality and a metropolitan area located in the northeastern region of São Paulo state, Brazil. Ribeirão Preto is the eighth-largest municipality in the State with 650.9 km2. It has an estimated population of 674,534 in 2018 and a metropolitan area of 1,178,910. It is located 313 km (194 mi) from the city of São Paulo and 706 km (439 mi) from Brasília, the federal capital. Its mean altitude is 526.8 meters (1,728 feet) high. The city's average temperature throughout the year is 23 °C (73F), and the original predominant vegetation is the Atlantic forest. The city was originated around 1856 as an agricultural region. Coffee was a primary income source until 1929 when it lost value compared with the industrial sector.

In the second half of the 20th century, investment in health, biotechnology, bioenergy, and information technology led to the city being declared a Technological Center in 2010. These activities have caused the city to have the 30th biggest gross national (GNP) in Brazil. The city is also an important cultural center. The Prefeito Luiz Roberto Jábali Park, the Maurilio Biagi Park, Carlos Raya Park, Santa Tereza Reserve, and the Zoo are important preservation areas. Pinguim Beerhouse, Dom Pedro Theatre, and projects such as Ribeirão Preto's Cinema Center are relevant sightseeing points, along with events such as the Agrishow Agricultural Fair, Tanabata Festival, Joao Rock Music Festival, and the National Outdoor Book Fair.

Source: Wikipedia