The color of the diamond is very important. A colorless, or white diamond is prefered and will have more sparkle, brilliance and fire than a diamond with color. If a diamond is not white, one of these three colors are usually visible: Yellow, Brown or Grey.
Many color distinctions are so subtle that they are invisible to the untrained eye; however, these distinctions make a very big difference in diamond quality and price.
Diamond Color Grading | GIA Video
GIA created the 4Cs (Color, Clarity, Cut, and Carat Weight) over 50 years ago as a universal method for establishing the quality of any diamond, anywhere in the world. The 4Cs mean two very important things: diamond quality can be communicated in a universal language, and diamond-buying consumers can know exactly what they are about to purchase.