The color scale to the right reflects how closely a diamond approaches the colorlessness. 

True colorless diamonds are quite rare and only make up a small fraction of all mined diamonds (Colors D-F); therefore most jewelry is made using diamonds in the near-colorless range (Colors G-J).

Diamonds are also available in a variety of colors including red, purple, pink, green, orange, yellow, blue, brown and black.  These extremely rare and unique diamonds are termed “Fancy Colors”.  Their color is more saturated than a Z color diamond and they are graded based on the hue, tone and saturation of their color.  The more intense the color, the higher the rarity factor.  The rarest of the fancy colors is red.