What is the GIA grading scale for diamond color?

The GIA grading scale for diamond color is indeed a progression from D to Z, where D represents completely colorless diamonds and Z indicates diamonds that exhibit noticeable light yellow color. This scale provides a standardized method for assessing the presence of color in diamonds, which is an important factor in determining overall quality and value. The scale operates under the principle that colorless diamonds are rare and more sought after, making them more valuable. As the scale progresses from D to Z, the degree of yellow or brown hue becomes increasingly apparent, influencing a diamond's desirability and pricing. Understanding this grading system is essential for evaluating diamonds effectively.