• Colour refers to a diamond's lack of colour, grading the whiteness of a diamond.
  • A colour grade of D is the highest possible, while Z is the lowest.
  • A diamond's colour grade is based on its lack of colour. The fewer colours a diamond have, the higher its colour grade. After cut, colour is generally considered the second most important characteristic when selecting a diamond. This is because the human eye tends to detect a diamond's sparkle first, and colour second. Diamonds graded J or better are colourless or near-colourless.

D Absolutely colourless. The highest colour grade. Extremely rare.
E,F Colourless Minute traces of colour can be detected by an expert gemologist
G,H Near-colourless Colour difficult to detect unless compared side-by-side against diamonds of better grades.
I,J Near-colourless An exceptional value with slightly detectable warmth or tone.
K,L,M Noticeable colour
N to Z Easily Noticeable colour