THE 4C's




Inclusions found within a diamond can be considered nature's birthmarks, the distinguishing characteristics that make the stone unique. When grading a diamond, the amount of inclusions and blemishes has a direct impact on its clarity and value. Flawless diamonds containing no inclusions are extremely rare and very expensive. A majority of the commercially sold diamonds contains inclusions that are undetectable to the unaided eye.

FL (Flawless) is the best clarity of diamond as it does not contain any inclusions or blemishes, under the scrutiny of 10x magnification. IF (Internally Flawless) diamonds may contain external characteristics (also known as blemishes) that are extremely difficult to view at 10x magnification on the stone's surface, if at all.

Pobjoy diamonds and diamond set jewellery range in clarity between IF and Si1.

Most importantly is that the diamond is 'eye-clean'. This simply means that it appears to the naked eye as being free from inclusions or blemishes unless looked at under a loupe or maginifying glass.


In simplified terms, the 'whiter' the diamond the better, with D being the most colourless. However, as can be appreciated from the colour table below, the naked eye will be pushed to identify any noticeable colouring until I.

It is also worth noting that some diamonds of similar GIA colour grading may display very subtle hints of brown, green or milkiness. That is why, among other variables (such as the nature of inclusions and cut) when comparing diamonds and prices there will invariably be some difference in market value between two apparently identically graded stones.

Pobjoy mainly supply diamonds between D and H.


Essentially the cut of a diamond measures how well it sparkles. Grading of the cut in descending order is Excellent, Very Good, Good, Fair or Poor. The cut grading currently only applies to round brilliant solitair diamonds as they are quantifiably easier to measure in terms of light performance.

Other shapes do not have an official cut grade but are sometimes given an estimated equivalent evaluation based on similar criteria. An Excellent cut grading will have the best light performance, mainly influenced by the relationship of surface table and the depth of the diamond (neither too deep nor too shallow).

Pobjoy generally suggests a cut grade of Excellent or Very Good as the difference in sparkle for each grade is negligable to the naked eye. Please note that the shape of a diamond is also often referred to as it's cut, but is not the same thing as the cut grading.


Average Carat Weight / Diamond Diameter IN MM

# Exact diameters will vary by individual diamond table and depth ratios