Diamonds are found in a range of colors. The most prized and sought after diamonds are colorless and, naturally, they are also very rare. It is a totally colorless diamond that allows white light to pass effortlessly through it and be dispersed as a rainbow of color. If a diamond is colorless and very transparent, it may be given a "D" color grade. This is the highest color grade in the Gemological Institute of America's (GIA) grading system. A diamond’s color is determined by looking at it under controlled lighting and comparing them to the color scale.

If you are looking for a diamond for an engagement ring or jewelry, you want to purchase the whitest diamond possible. Most people tend to stay between E and H, and many use yellowish coloring of W-Z diamonds for earrings and other jewelry. Diamond color is a matter of preference, availability and your budget.