This is an Organic Gemstone, formed by accident, without human intervention. It is formed inside a Pearl Oyster. One of the most valuable gems in antiquity, pearls are highly valued. They are evaluated according to size, colour, lustre, regularity of form, compactness. In case of a number of pearls in a piece of jewellery, much depends on their uniformity of colour or, at any rate, how well matched they are. A string of pearls of equal diameter is worth much more than one consisting of pearls of graduated diameters because numerous pearls of a uniform size are harder to find. Even a pair of matching pearls is worth more than double the price of a single pearl. Pearls have a pearly lustre.
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in section "Pearl"