How can you assess a diamond's color, and what are the different grades of diamond color?

One of the four Cs of diamond evaluation is color, which refers to the presence or absence of color in a diamond. The most valuable diamonds are those that are completely colorless, while diamonds with more color are generally less valuable. Diamond color is graded on a scale that ranges from D (colorless) to Z (light yellow or brown). The color grading is done by comparing the diamond to a set of master stones of known color. There are several factors that can affect the appearance of a ....