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GIA
The Gemological Institute of America (GIA) has a laboratory named the Gem Trade Laboratory (GTL), which is one of many independent grading and testing labs in the United States. These laboratories employ experts in the field of diamond grading. These experts have many years of experience in grading and analyzing diamonds, and go to painstaking lengths to ensure that each stone studied is given the appropriate grade. Each stone is analyzed by three different experts to ensure its proper grading. The analysis is summarized for anyone to review in what is termed a "Diamond Quality Analysis Report" also called a "Certificate".
A certificate conveys the essential information and key characteristics of each individual diamond. Most importantly, each diamond's value will be heavily influenced by the overall analysis on the certificate. A certificate should mention several key features, including shape and cut, carat weight, proportions, finish, clarity, grade, and color grade. Many certificates will also include comments written by the evaluator and a sketch of the diamond showing the location of imperfections.
AGS
The American Gem Society (AGS) was created by Robert M. Shipley, founder of GIA, and consists of industry leaders dedicated to maintain the highest possible standards of ethics and professionalism in the jewelry industry. The AGS laboratories provide very thorough and complete grading reports. AGS laboratories is a premier grading laboratory that offers diamond cut grades for fancy cuts such as princess and emerald cuts as well as round brilliant cut diamonds. AGS laboratories have one of the highest standards of evaluating diamond quality so you are assured that the grade of the diamond is equal to the diamond's quality.
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