The AGS Laboratories is the world’s premier diamond grading laboratory for diamond cut, the premier laboratory to offer a diamond cut grade for fancy shapes such as princess cut and emerald cut, and the foremost diamond grading laboratory created to protect the consumer. AGS Laboratories diamond grading reports offer an easy-to-read grading scale that provides a simple basis for comparison to other diamond reports. The AGS Laboratories Diamond Reports provide you with all the information you need to make the best possible buying decision.

The AGS Laboratories have provided high-quality diamond grading services since 1996. AGS Laboratories has maintained its reputation as an industry leader through its innovative approaches to diamond grading and consistent adherence to the American Gem Society’s standards and ethics of consumer protection.

The AGS Laboratories Diamond Quality Document (DQD) is the premier diamond report for Cut and for not only the round brilliant cut, but the princess cut, emerald cut and other fancy shaped cut diamonds. The Diamond Quality Document also provides a complete grading analysis of Color, Clarity and Carat Weight. When it comes to the 4Cs of a diamond, the DQD is the most thorough diamond grading report in the industry. AGS launched its Performance-Based Cut Grading System in 2005, and since then, AGS Laboratories has been implementing the Light Performance Diamond Cut Grade in its DQD. In the Light Performance Diamond Cut Grade, all facets of a diamond are measured in three dimensions rather than two dimensions. The measurements are used by a computer program to trace light rays traveling through a diamond. The ray-tracing program shows the quantity and quality of the light being returned to the viewer. In addition to proportion, polish, and symmetry, AGS Laboratories also considers brightness, dispersion, leakage, contrast and spread in assigning the final cut grade.

Upon receipt of stones, AGS Laboratories offers a five-business day turnaround to obtain the grading results. Another benefit of AGS Laboratories is its laser inscription service, which utilizes a distinctive cold vapor process. AGS Laboratories can inscribe anything from trademarks and logos, to text, serial and personalized messages. With an AGS Laboratories diamond grading report, you are assured that the grade of the diamond is equal to the diamond’s quality. Consumers benefit from AGS Laboratories diamond grading reports because they are empowered with detailed information about their diamond, and can rest assured that the diamond report is the industry's most thorough and consistent. That’s the kind of assurance a diamond grading lab should always give. It is the AGS Laboratories promise.