Welcome to the GIA Laboratory
GIA revolutionized the diamond industry in 1955 with its Diamond Grading Report. Based on the 4Cs of diamond value and International Diamond Grading System™, both of which GIA created, the grading report provides a comprehensive analysis of quality and authenticity for diamonds in the D-to-Z color range. It contains information on diamond shape and cutting style, measurements and weight, proportions and finish along with grades for clarity, color, and cut. In addition, it identifies any known treatments. While a number of laboratories issue similar reports, the GIA Diamond Grading Report has earned a preeminent reputation for unrivaled accuracy and integrity when assigning diamond grades.For stones between 0.15 and 1.99 carats, GIA offers the Diamond Dossier®. It contains the same information found on the traditional diamond grading report but in a more concise format. As an added security measure, the Diamond Dossier® includes a laser inscription of the identification number.
GIA employs hundreds of highly trained diamond graders, gemologists, and research scientists who scrutinize the diamonds. And, depending on size, as many as 40 pairs of eyes may analyze each stone. GIA Laboratory experts have graded some of the world’s most famous diamonds, including the legendary Hope Diamond (45.52 carats) and the De Beers Centenary Diamond (273.85 carats).