![Colors](https://d2dtfeai6qg5ne.cloudfront.net/sde-group/new/img/education/01.webp)
GIA’s diamond color grading system measures the absence of color, starting with D as colorless and continuing to Z representing light yellow or brown. The distinctions between color grades are so subtle that they are often invisible to the untrained eye but can make a big difference in diamond quality and price.