The intensity of the color is described as how strong the color is shown in the diamond. The color can be anywhere between a soft whisper to a strong vivid shade. GIA developed an intensity scale to properly define the intensity level of the diamond.
Though the carat weight, the cut, and the clarity are all extremely important factors of the diamond quality, the color and intensity of the diamond are the most relevant characteristics with regards to the value of the stone.
The image shows the different intensity levels of Pink, Blue, and Green diamonds.
From left to right: Faint, Very Light, Light, Fancy Light, Fancy, Fancy Intense, Fancy Vivid and Fancy Deep
History of Color Grading
The fancy colored diamond grading scale was developed by the GIA in the mid-1970s. With the growth in popularity of fancy colors, the industry required some sort of a standardized list in order to better define and understand the stones. Unlike colorless diamonds, because there are so many color combinations available, the decision was made to grade natural fancy colored diamonds with a description as opposed to a letter.