All diamonds are graded for colour which is one component of the 4C’s that helps determine a diamonds value (price). Diamonds that range from colourless to light yellow and light brown fall within the normal colour range, this is also called the D-to-Z scale. A diamond that shows yellow or brown colour beyond the D-to-Z scale is classified as a fancy-coloured diamond, as well as any other colour i.e. pink.
The scale begins with D (Colourless) and continues through the alphabet to Z (light yellow). When all other value factors are the same, meaning a diamond has the same clarity, cut, and carat weight. Colourless diamonds are the most valuable.
The levels of the colour scale are divided into colourless D-E-F, near colourless G-H-I-J, faint yellow K-L-M-N, very light yellow N-R, light yellow S-Z.
The difference between one colour grade and another on the D-to-Z scale can have a big impact on value (price).
When purchasing a diamond the colour is not the only factor you should consider. You need to be aware of the 4C’s and make your decision based on all four factors. Just because a diamond has a colour grade of D-E-F doesn’t mean it is a perfect diamond. You need to consider the clarity (clarity is a gemstones relative freedom from inclusions and blemishes), cut (cut refers to a diamonds proportions and the quality of its finish), as well as the colour before you make the decision that this is the diamond you would like to purchase.