The 4 C's of Diamond Quality
What are the 4Cs of a diamond, especially when it comes to diamond grading?
Every single diamond in the world is unique. And each has specific qualities that establish its value. Because they are so varied, until the middle of the 20th Century there was no agreed-upon standard for diamonds to be judged. The Gemological Institute of America (GIA) created the first, and now globally accepted standard for describing and judging the value of a diamonds: Color, Clarity, Cut, and Carat Weight.
Of all the 4Cs, Cut has the greatest effect on a diamond’s beauty. In determining the quality of the cut, the diamond grader evaluates the cutter’s skill in the fashioning of the diamond. The more precise the cut, the more captivating the diamond is to the eye.
Color Gem-quality diamonds occur in many hues. In the range from colorless to light yellow or light brown. Colorless diamonds are the rarest.
Other natural colors (blue, red, pink for example) are known as "fancy”, and their color grading is different than from white colorless diamonds.
Diamonds can have internal characteristics known as inclusions or external characteristics known as blemishes. Diamonds without inclusions or blemishes are rare; however, most characteristics can only be seen with magnification.
The carat is the diamond’s physical weight measured in metric carats. Carat weight is the most objective grade of the 4Cs.