1. What is Carat Weight?

Carat Weight is a diamond's physical weight measured in metric carats. One metric carat equals 0.200 g. or one-fifth of a gram. In more familiar terms, that is a little more than 0.007 of an ounce avoirdupois. Avoirdupois is the common weight system we use in the United States. For precision, the carat is further divided into hundredths, and each of those is called a point. In the AGS Laboratories diamond lab, Carat Weight is measured using a digital scale. More information on a diamond’s Carat Weight.

2. How does AGS Laboratories determine the Clarity Grade of a diamond?

Clarity is the degree to which a diamond is free from inclusions and blemishes. Inclusions are internal characteristics; blemishes are external characteristics. Many diamonds have Clarity characteristics that can be seen only with magnification. The Clarity grade is subjectively based on nature, location, size, quantity, and relief of the inclusions. A minimum of two experienced diamond graders grade each diamond for the Clarity grade.

3. How does AGS Laboratories determine the Color Grade of a diamond?

Color normally refers to where a diamond's Color falls within the range from colorless to light yellow or light brown. At the AGS Laboratories, the Color of a diamond is determined by at least two experienced color diamond graders using a set of master diamonds.

4. Does AGS Laboratories place a value on the documents they issue?

No. AGS Laboratories provides an unbiased, independent, expert, third party opinion on the 4Cs of a diamond. You should never see an appraisal on a diamond grading report, price is not up to the laboratory, it is up to your jeweler.