Pearl is created by shelled mollusk. The process of creation is when the shelled mollusk protected itself from sands that were coming inside of the shells and then the shelled mollusk created fluids to wrap the sands over and over until it becomes pearl. It takes a long time, yes, for natural pearl it takes a long time to be done. Some might say in the personification idiom that the pearl is created by the tears of the shelled mollusk. The shelled mollusk always cries when sands hurt them and the pearl is the compilation of the tears.
Pearl has so many colors, white, pink, silver, cream, golden and many more. It depends on the customers favor on what color they want to have. The black pearl is the most expensive pearl because it is being known famously for its rarity. Not every shelled mollusk could create a black pearl. Because of its rarity, black pearl becomes the most expensive pearl in the world. Pearls only sells most of these rare pearls.
Pearl has always become the favor for some ladies. Career women, mostly when they are go to work, they might feel uncomfortable wearing shiny and sparkly gems like diamond or emerald. For solution, they rather choose pearl because pearl would create simplicity yet still elegance image for the user.