For centuries, pearls have delighted with their nobility and uniqueness, resulting mainly from their organic origin and rarity. What distinguishes them from other valuable jewelry decorations is the fact that they come from water, not the earth’s crust – like most precious jewels. Moreover, they are the only minerals used in jewelry that are produced by animals, namely, they are formed inside the shells of bivalves and clams. The process of their formation is the natural protection of the mollusk against a foreign body, most often a grain of sand, which gets into its shell. This is when the clam begins to produce layers of mother-of-pearl, the same from which its shell is made, to form the wild pearl. This process typically takes up to two years, therefore, taking into account such a long time of their formation and extreme rarity (apparently 1 pearl is produced by 1 in 15,000 clams), pearl deserved to be treated as one of the most valued and desired materials, gaining the title of the queen of jewels.