The more color a diamond has, the less light passes through the stone to make it sparkle. A colorless diamond allows more light to pass through it to create the maximum amount of brilliance. Colorless diamonds, however, are extremely rare.
Most diamonds have subtle shade differences, ranging from nearly colorless to light yellow. Most appear colorless to the unaided eye. The diamond industry uses a letter system to grade the color of diamonds, from D (colorless) to Z (light yellow). A diamond with less color is more valuable. At Wal-Mart, we take pride in offering diamonds with a color grade of J or better.