The GIA Cut Grading System is based on what?

• A. Market demand and retail trends.
• B. Scientific research and observation.
• C. Historical precedence of cuts.
• D. Only the opinions of diamond graders.

Answer: (B)

Understanding how light behaves in a diamond is what the cut grade is all about. The GIA Cut Grading System rests on scientific research and careful observation of how proportions, symmetry, and finish affect light performance—how bright the stone is, how it displays fire, and how its sparkle looks from different angles. This approach uses measured data, optical studies, and reproducible findings to define criteria, not just opinions or trends.

Market demand and retail trends can influence price or popularity, but they don’t set the objective criteria for cut grade. Historical precedence of certain cuts may guide styles, yet the grading system evaluates current light behavior with standardized methods.