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Cut Quality Shape
ROUND OVAL MARQUISE PEAR
HEART EMERALD PRINCESS RADIANT
Diamonds are cut into different shapes to make the
best of their natural properties. The brilliant-cut (round)
diamond is the most popular for use in jewellery.
The cut quality of a diamond refers to the proportions of
the different facets of the diamond, as shaped by the
human hand. The most
skilled diamond cutter
will arrange the facets to
maximise the fire and
brilliance of the stone.
100%
58%
13.5%
43.5%
33º
41.2º
98º
Girdle
Thickness
58%
Colour
D E F G H I J K L M N-O P-R S-Z
EXC.
WHITE+
EXC.
WHITE
RARE
WHITE+
RARE
WHITE
WHITE SLIGHTLY TINTED
WHITE
TINTED WHITE TINTED COLOUR
Diamonds are graded by colour on a scale from D to Z. D is colourless – a truly white diamond. Anything up to and including
colour H is considered white, with a hint of yellow appearing in diamonds graded from I onwards. Colourless (white)
diamonds are the rarest, and therefore the most valuable.
Clarity Grade
IF VVS1 VVS2 VS1 VS2 SI1 SI2 SI3 I1
The clarity grade refers to naturally occurring flaws, known as 'inclusions', within the diamond. VVS stands for 'Very Very
Slight [inclusions]', VS means 'Very Slight', SI means 'Slightly Included' and 'I' means 'Included'. Inclusions interrupt the flow
of light in the diamond, which means included diamonds sparkle less than flawless (IF) ones, but diamonds with clarity
grades up to Si3 should not have inclusions that can be seen with the naked eye.
Carat Weight
.05 .10 .15 .20 .25 .50 .75 1.00 1.25 1.50 2.00 2.50 3.00 4.00 5.00
Diamond size is measured in carats, which refers to the weight of the stone rather than its exact proportions. The pictures
below show the approximate size of each diamond by carat weight.
Diamond Grading Chart
The Four Cs
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