Pearl vs Xinjiang

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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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Xinjiang (Uyghur: شىنجاڭ‎‎, SASM/GNC: Xinjang; Chinese: 新疆; pinyin: Xīnjiāng; alternately romanized as Sinkiang), officially Xinjiang Uyghur Autonomous Region (XUAR), is an autonomous region of the People's Republic of China (PRC), located in the northwest of the country close to Central Asia. Being the largest province-level division of China and the 8th-largest country subdivision in the world, Xinjiang spans over 1.6 million km2 (640,000 square miles), and has about 25 million inhabitants.Xinjiang borders the countries of Mongolia, Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, Pakistan and India. The rugged Karakoram, Kunlun and Tian Shan mountain ranges occupy much of Xinjiang's borders, as well as its western and southern regions. The Aksai Chin region, administered by China mostly as part of Xinjiang's Hotan Prefecture, is claimed by India. Xinjiang also borders the Tibet Autonomous Region and the provinces of Gansu and Qinghai. The most well-known route of the historical Silk Road ran through the territory from the east to its northwestern border. It is home to a number of ethnic groups, including the Turkic Uyghur, Kazakhs and Kyrgyz, the Han, Tibetans, Hui, Tajiks, Mongols, Russians and Xibe. More than a dozen autonomous prefectures and counties for minorities are in Xinjiang.

Xinjiang is also referred to as Chinese Turkestan, East Turkestan and East Turkistan. Xinjiang is divided into the Dzungarian Basin in the north and the Tarim Basin in the south by a mountain range. Only about 9.7% of Xinjiang's land area is fit for human habitation.With a documented history of at least 2,500 years, a succession of people and empires have vied for control over all or parts of this territory. The territory came under the rule of the Qing dynasty in the 18th century, later replaced by the Republic of China government. Since 1949, it has been part of the People's Republic of China following the Chinese Civil War. In 1954, Xinjiang Bingtuan was set up to strengthen the border defense against the Soviet Union and also promote the local economy. In 1955, Xinjiang was administratively changed from a province into an autonomous region. In recent decades, abundant oil and mineral reserves have been found in Xinjiang and it is currently China's largest natural gas-producing region. In the 1990s and 2000s, the East Turkestan independence movement, separatist conflict and the influence of radical Islam have resulted in unrest in the region with occasional terrorist attacks and clashes between separatist and government forces.

Source: Wikipedia