Easy to locate with the unaided eye. Very easy to locate with the unaided eye. It is important to note that the GIA Grading system is not static, and has changed slowly over time. Color describes the amount of color the diamond contains. This can range from colorless to yellow with slight tints of yellow, gray or brown.
Colors can also range from intense yellow to brown, blue, green, pink and red.
These fancy colors are rare and therefore more valuable. It is possible to influence the color by irradiation treatment followed by heat treatment. This method is not recommended for two reasons. The first is the risk involved with exposure to irradiated objects. The second is the risk of color change over time.