Founded in 1996, AGS Laboratories led in-depth analysis of diamond cut quality in the early 2000s, establishing its Ideal report as a benchmark in 2005. Achieving this grade was initially difficult for most diamonds, limiting AGSL’s reach to a niche market of predominantly AGS member wholesalers and retailers. The GIA started its research in 1997 but did not launch its round-cut grading system until 2006.
AGSL continued to refine its research and introduced a light performance-based grading system in 2005. This system, assessing over 30,000 light rays interacting with the diamond’s facets, set a new standard. It was adaptable for various shapes and facet patterns, allowing grading for new cuts.
The GIA’s acquisition shows their plan to use AGSL’s advanced method, starting with the AGS Ideal reports for fancy shapes. The GIA kept AGSL’s original criteria, allowing certain cuts like oval, emerald, princess, and select cushion cuts to qualify for the AGS Ideal grade if they meet the standards.