The GIA and EGL USA Color Grade is from D (colorless) to Z (brown or light yellow). Most Lab-Grown Diamonds on Lab-Grown Diamond jewelry are nearly colorless, they usually have small tints of yellow or brown. Colorless Lab-Grown Diamonds are very rare, the most expensive Lab-Grown Diamonds are D color or Icy white, Lab-Grown Diamonds that are more yellow than the Z color are called Fancy color Lab-Grown Diamonds. Fancy color Lab-Grown Diamonds are actually more expensive than most Lab-Grown Diamonds, sometime, they even fetch higher than the D color Lab-Grown Diamonds.

Lab-Grown Diamonds are color graded by placing the Lab-Grown Diamond's table down and comparing the color to a master stones with special white lighting. Glassy looking cuts such as Asscher and Emerald cut Lab-Grown Diamonds show more color compared to ideal cut rounds Lab-Grown Diamonds. Brighter cuts faced up is more colorless and you can see their actual color when you look from the side of the Lab-Grown Diamond.

It is easier to determine the color of a Lab-Grown Diamond in a white setting such as a platinum or white gold ring. If you have a yellowish Lab-Grown Diamond, setting that Lab-Grown Diamond in a rubbed over bezel style setting can improve the apparent color by a couple of grades.

Some people prefer warmer colors between J - L on their yellow gold setting since it is not as apparent, it all boils down to saving money in order to get a higher carat weight or a better cut grade. Among the Lab-Grown Diamond 4C's, color is a subject of preferences which can basically depend on the customer.

Some Lab-Grown Diamonds can emit a visible light when exposed to ultraviolet radiation, this is called fluorescence. Fluorescence is not a factor in determining color or clarity grades of a Lab-Grown Diamond. However, a description of a Lab-Grown Diamond's fluorescence strength is provided on EGL USA and GIA reports is present as an additional Lab-Grown Diamond characteristic.