Understanding the colour grading scale of diamonds is important when shopping for an engagement ring or other diamond jewelry. The scale ranges from D-Z, with D-F being colorless and barely showing any color, G-J being near colorless with a faint trace of color, and K-M showing a faint warm yellow tone. Diamonds in the N-Z range have a more obvious light to very light yellow color. Colored diamonds beyond the white range, such as yellow or pink, are even more rare and command higher prices than colorless diamonds.