Diamond Colour – Sydney Australia

The best diamond colour is NO colour. The less colour in a diamond, the more colourful the fire, and the better the colour grade.

D: Absolutely colourless. The highest colour grade, which is extremely rare.
E: Colourless. Only minute traces of colour can be detected by an expert gemmologist. A rare diamond.
F: Colourless. Slight colour detected by an expert gemmologist, but still considered a “colourless” grade. A high-quality diamond.
G-H: Near-colourless. Colour noticeable when compared to diamonds of better grades, but these grades offer excellent value.
I-J: Near-colourless. Colour slightly detectable. Very good value.
K: Slightly tinted. Good value
L-Z: Not carried at Delphi Diamonds


Rare White


Commer White

Slightly Tinted

Faint yellowYellow


At Delphi Diamonds, you’ll find only the finest diamonds with colour graded D-K . Diamonds graded better than K are colourless or near-colourless — their colour is typically undetectable to the unaided eye.

The colour in diamonds graded K -Z detracts from the beauty of a diamond. It’s especially noticeable set in platinum or white gold.


Some people seek diamonds that produce this unique effect, while others definitely avoid it. The visible effects of fluorescence
grades of faint, inert, negligible, and medium, can only be detected by a trained gemmologist. A fluorescence grade of strong
or very strong can make a diamond with a near-colourless grade look even whiter yet in some instances give the diamond a
slight hazy or oily appearance. Diamonds with a strong or very strong fluorescence are priced slightly lower than other diamonds.

What Colour Grade Is Best?

  • For the purist, look for a colourless diamond with a grade of D-H and a fluorescence rating of faint, inert, none, or negligible.
  • For an excellent value in a diamond with no noticeable colour to the unaided eye, look for a near-colourless grade of I-K , and
    a fluorescence grade of medium or strong blue.
  • Or, if you’d rather not compromise on colour but would like to stay on budget, choose a diamond with a good cut, SI1–SI2
    clarity, and consider going with a strong fluorescence. It will still be beautiful to the unaided eye and you may prefer the unique effect of a strong fluorescence.