The 4Cs of Diamond Grading
Gem-quality diamonds occur in many hues. In the range from colorless to light yellow or light brown, colorless diamonds are the most rare. Other natural colors are known as fancy — their color grading is unique. These small, subtle differences in color can make a substantial difference in value. If a diamond is well cut, its refraction and dispersion often will disguise certain degrees of coloration. Unless a diamond is a fancy color (or any color other than colorless to light yellow or brown), the American Gem Society™ Color Grading System places it on a 0 – 10 scale, with 0 being colorless. To accurately and consistently grade color, an American Gem Society Laboratories trained diamond grader will use special lighting to compare the diamond being graded to a set of American Gem Society Master Color Comparison Diamonds, which have met exacting standards of Cut, Color, Clarity, and Carat Weight.
To learn more about the American Gem Society Diamond Cut Grade Scale go to our Diamond Color Grade page under the AGS Grading System menu.
