A colored diamond is a diamond that has a hue other than the typical colorless appearance of most diamonds. The color of a diamond is caused by impurities or structural defects in the crystal lattice, such as the presence of nitrogen or lattice distortions caused by the presence of another element. Colored diamonds can come in a wide variety of colors, including yellow, pink, blue, brown, green, and red. The intensity and saturation of the color, as well as the rarity of the particular color, can affect the value of a colored diamond. The rarest and most valuable colored diamonds are those that are intense and saturated in color, such as the Pink Star diamond, which sold for over $71 million at auction in 2017.