Moscow vs Pearl

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Moscow (, ; Russian: Москва, tr. Moskva, IPA: [mɐˈskva] (listen)) is the capital and largest city of Russia. The city stands on the Moskva River in Central Russia, with a population estimated at 12.4 million residents within the city limits, while over 17 million residents in the urban area, and over 20 million residents in the Moscow Metropolitan Area. The city covers an area of 2,511 square kilometres (970 sq mi), while the urban area covers 5,891 square kilometres (2,275 sq mi), and the metropolitan area covers over 26,000 square kilometres (10,000 sq mi). Moscow is among the world's largest cities, being the most populous city entirely within Europe, the most populous urban area in Europe, the most populous metropolitan area in Europe, and also the largest city by land area on the European continent.Originally established in 1147, Moscow grew to become a prosperous and powerful city that served as the capital of the Grand Duchy that bears its namesake. When the Grand Duchy of Moscow evolved into the Tsardom of Russia, Moscow still remained as the political and economic center for most of the Tsardom's history. When the Tsardom was reformed into the Russian Empire, the capital was moved from Moscow to Saint Petersburg, diminishing the influence of the city. The capital was then moved back to Moscow following the Russian Revolution and the city was brought back as the political centre of the Russian SFSR and the Soviet Union. When the Soviet Union dissolved, Moscow remained as the capital city of the contemporary and newly established Russian Federation. As the northernmost and coldest megacity in the world, and with a history that dates over eight centuries, Moscow is governed as a federal city that serves as the political, economic, cultural, and scientific centre of Russia and Eastern Europe.

As an alpha world city, Moscow has one of the world's largest urban economies, and is one of the most expensive cities in the world, and is also one of the fastest growing tourist destinations in the world. Moscow is home to the third-highest number of billionaires of any city in the world, and has the highest number of billionaires of any city in Europe. The Moscow International Business Center is one of largest financial centres of Europe and the world, and features some of Europe's tallest skyscrapers. Moscow is also home to the tallest free-standing structure in Europe, the Ostankino Tower, and was the host city of the 1980 Summer Olympics, and one of the host cities of the 2018 FIFA World Cup. As the cultural centre of Russia, Moscow served as the home of Russian artists, scientists, and sports figures due to the presence of its numerous museums, academic and political institutions and theatres. The city is home to several UNESCO World Heritage Sites, and is well known for its display of Russian architecture, particularly its historic buildings such as the Saint Basil's Cathedral, the Red Square, and the Moscow Kremlin, of which the latter serves as the seat of power of the Government of Russia. Moscow is home to many Russian companies in numerous industries, such as finance and technology. Moscow is served by a comprehensive transit network, which includes four international airports, nine railway terminals, a tram system, a monorail system, and most notably the Moscow Metro, the busiest metro system in Europe, and one of the largest rapid transit systems in the world. With over 40 percent of its territory covered by greenery, it is one of the greenest cities in Europe and the world.

Source: Wikipedia

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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