Good color is no color.     

         Diamonds are found with a range of colors, from faint yellow or brown to the very rare pinks, blues, greens and other colors known as "fancies". However the best color for a diamond is no color. It is totally colorless diamond that allows white light to pass effortlessly through it and to be dispersed as rainbows of color. And to give to someone such a diamond is to show your true colors as well.

How to tell a diamonds color.

  But is it clear? How can I tell?