Pearl vs Sendai

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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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Sendai (仙台市, Sendai-shi, Japanese: [seꜜndai]) is the capital city of Miyagi Prefecture, Japan, the largest city in the Tōhoku region, and the second largest city north of Tokyo. As of 1 June 2020, the city had a population of 1,091,407 in 525,828 households, and is one of Japan's 20 designated cities. The city was founded in 1600 by the daimyō Date Masamune. It is nicknamed the City of Trees (杜の都, Mori no Miyako); there are zelkova trees lining many of the main thoroughfares such as Jōzenji Street (定禅寺通, Jōzenji dōri) and Aoba Street (青葉通, Aoba dōri).

In the summer, the Sendai Tanabata Festival, the largest Tanabata festival in Japan, is held. In winter, the trees are decorated with thousands of lights for the Pageant of Starlight (光のページェント, Hikari no pējento), lasting through most of December. On 11 March, 2011, coastal areas of the city suffered catastrophic damage from a magnitude 9.0 offshore earthquake, which triggered a destructive tsunami.

Source: Wikipedia