Pearl vs Delingha

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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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Delingha (Chinese: 德令哈; pinyin: Délìnghā; Tibetan: གཏེར་ལེན་ཁ།, Wylie: gter-len-kha, ZYPY: Dêrlênka), or Delhi (SASM/GNC/SRC romanization of Mongolian: Delhi hot), is the seat of the Haixi Mongol and Tibetan Autonomous Prefecture in northern Qinghai province, China. It is located approximately 200 km (120 mi) southeast of the Da Qaidam Administrative Region. It is a mainly industrial county-level city. The Bayin River divides the city into two parts: Hedong (河东; 'River East') and Hexi (河西; 'River West'). Because the prefecture seat is located in Hedong, it is slightly more flourishing than Hexi, which is chiefly agricultural.

Established in 1988, Delingha administers seven township-level divisions covering an area of 27,700 km2 (10,700 sq mi) and has a total population of 78,184, making it the smallest of the five cities in Qinghai. The name of the city comes from Mongolian and means "golden world" ᠠᠯᠲᠠᠨ ᠳᠡᠯᠡᠬᠡᠢ, reflecting the relatively large Mongol population of the city. Da Qaidam administrative zone merged into Delingha in mid-2018.

Source: Wikipedia