The cut refers to both the shape and style of a diamond, as well as its proportions,
symmetry and finish. The cut influences how light interacts with the stone to show its
brilliance and sparkle, with the best cuts bringing out the luminosity of the stone.
Diamonds range in colour from the colourless “D” rating to the light yellow “Z". This
difference can be very subtle but almost all stones will have a trace of yellow, brown
or grey in them. The colour is assessed by a gemologist who uses a standardised set of
master diamonds to give each stone its letter grading.
The clarity of a diamond is determined by how flawless it is. Because they are generally
naturally formed stones, most diamonds carry at least some minor imperfections. The
number and size of these flaws is used to assess each diamond's clarity grading. Only
diamonds found to have no imperfections under 10x magnification receive the Flawless
The weight of a diamond is measured in carats and is the most significant factor
considered when assessing the value of a stone. The larger the diamond, the heavier it
is. However, a big diamond that performs poorly in the other 4 C's is likely to be
valued significantly lower than a small diamond that achieves high ratings in these
Confidence is the fifth - and most recent C. It refers to the diamond having a grading
certificate from an independent and reputable grading laboratory which verifies its
authenticity. Diamond grading certificates typically include all the unique
characteristics of your diamond, as well as individual gradings for the 4 other C's -
cut, colour, clarity and carat weight.