Diamonds are derived and also obtained from mines in which they are cut from rocks, but pearls do grow naturally in oysters, and they are found on the sea bed areas. While pearls can be cultivated artificially by man, by the act of putting a mother pearl inside the shell of an oyster, diamond, on the other hand, cannot be cultivated artificially. The pricing system of pearls and diamond differs. While diamonds are priced based on the cut, color, and carat rating, the pricing system of pearls is based on the luster and rarity. In all, diamonds are very much more expensive when compared to pearls. Depending on how well-cut diamond is, a diamond can be cut into several shapes which include, round, square, triangle, oblong, etc., while the natural shape of pearls is just round. Pearls cannot be converted or cut into several different shapes, although pearls differ in size.