The 4 'C's

 
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Understanding a
Diamond Laboratory Report

The 4 C'

COLOUR

The rarest and most sought after colour in a diamond is the most colourless one often called 'blue white' or 'Gem' stone.

Laboratories give different labels and values to colours.

The GIA will start at the 'D' of the alfabet ending with 'Z'

The HRD follows the European 'CIBJO' grading system from 'exceptional white+' down to 'tinted colour'.

The IGI, EGL and DIAMEX follow basically both these guidelines.

Colour classification is determined by comparing the diamond
to a set of master colour stones.
Not all laboratories necessarily come to similar conclusions
as these master stones and lighting conditions can vary somewhat.
Also a colour spectrum is open to appreciation
depending on the eye and circumstances of observation.

Please consult the chart below

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brilliant cut

emerald cut

heart shape

marquise cut

oval cut

pear shape

princess cut