GIA-Certified Diamonds

The 4Cs — Color, Clarity, Cut, and Carat Weight — form the basis of the International Diamond Evaluation System described in the source as having been introduced by GIA in 1950.

The source also notes that the system later became widely accepted across the diamond industry, helping consumers and professionals compare diamond quality more consistently.

When a jewelry piece contains a diamond certified by GIA, the corresponding grading report can accompany the jewelry, providing documented information about the stone’s characteristics.