Generally, when we talk about the color of a diamond, we refer to an absence of color and the superb it tends towards the purest colorless white. But diamonds exist naturally, in all colors of the light spectrum. This is called the colored diamond or fancy color diamond.
The fancy yellow diamond is the most popular colored diamond. Nitrogen atoms give the color to this kind of diamond.
But there are also orange, green, brown, chestnut (icy, milky), blue, purple, pink and black diamonds.