Pearl was my mother favorite jewelry and she told me a lot of pearl formation stories. I do not remember all but i do know where Pearl comes from. Pearl will form from Oyster /Mussels/Clam with the purpose of a protection layer when irritation occur. Layers of glossy liquid called Nacre, a kind of mineral substance, will be coated layers by layers mixed with grain of sand until a beautiful Pearl created. This process sounded easy but it can take from years to years. (from 2 years up to 20 years) – this is why Pearl is so expensive.