Diamond grading requires more than simply understanding the 4Cs. For anyone looking to develop professional grading skills, practical training in color, clarity, cut, carat weight, inclusions, and diamond identification can be very useful.

The Advanced Diamond Grading Program at the International Institute of Gemology (IIG) provides focused training in professional diamond grading and microscopic evaluation. The course covers the international 4Cs—Clarity, Cut, Color, and Carat—along with clarity plotting, fluorescence, polish, symmetry, proportions, and diamond measurement.

Students also learn how to distinguish diamonds from simulants and synthetics such as cubic zirconia, moissanite, and synthetic diamonds. The program includes practical training with instruments such as a 10x loupe, gauges, and sieves.

The course is suitable for diamond assorters and graders, jewellery business owners, manufacturers, retailers, wholesalers, lab graders, instructors, and diamond enthusiasts.