D - F: Colourless: the most valuable and desirable colour grade because the maximum amount of light passes through this colour range.
G - J: Near Colourless: these stones appear colourless to the untrained eye and can appear colourless after being mounted (especially in yellow gold).
K - M: Faint Yellow: slightly tinted with yellow colour to the untrained eye, but still considered desirable for affordable pieces of jewelry.
N - R: Very Light Yellow: visible yellow tint to the untrained eye.
S - Z: Light Yellow: highly noticeable yellow tint to the untrained eye.

Each letter marks a different colour grade. Increased shadings of yellow reduce the value of a
diamond, they do not necessarily reduce its beauty. Well cut diamonds can disguise colouration
through their fire and brilliance. The best way to judge a diamond's colour is to look at it on a white background. The ideal colour for a diamond is no colour.

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