Why Are There Two Clarity Grades for AGS 7?
By Wade Abel, CG, Director of Gemological Services, AGS Laboratories Recently we received a question that is important for our clients to understand. The inquiry was about the clarity grade AGS 7, which has two categories, AGS 7 (SI2) and AGS 7 (I1). The AGS grading system uses a 0-10 grade scale for three of the 4Cs: Cut, Clarity, and Color. This is an easy way to understand where the diamond fits relative to others. The system is a deduction-based scale which means that 0 is the best grade and 10 is the worst. The AGS Ideal® 0 is well