Most people think diamonds are
colorless, however in reality diamonds come in every color of the rainbow from yellows and browns to green, blue, purple, red, pink, grey and even black. The "C" for color refers to the presence or absence of tinges of color in any particular stone. The closer a diamond comes to colorless, the more valuable it is.

 
The color element of a diamond is created by chemicals or minerals captured in the diamond crystals as they grew in the earth's surface over millions of years. For example the presence of boron would naturally give a diamond a blue tint and so on.

  Most diamonds are graded using the GIA color scale that begins with "D" for most colorless and continue up to "Z". As the tints become more visible, the grade moves up the alphabet. However, the less presence of color noticeable in a diamond the rarer it is to find, therefore making it more desirable and valuable.
 

 
Though GIA's color scale grades diamonds between D (colorless) to Z (noticeable tint), there are also diamonds that exceed the diamond grading charts. These diamonds are much rarer to come by and are considered "fancy" in color. Fancy color diamonds are highly desirable and command higher value than diamonds which are on the charts.