The weight or size of a diamond is measured in carats (ct.). A carat is 0.2 grams and there are 100 points (or 200 milligrams) per carat.

With an accuracy of 1/100,000 ct,
the IGI scales provide a highly precise diamond weight and this weight is specified on the Diamond Report to two decimal points.

Cut
Carat		 Clarity
Colour
S.I.1, S.I.2 P.1 - I.1 P.2 - I.2 P.3 - I.3
Slightly Included Imperfect Imperfect Imperfect
Inclusions and external blemishes easy to locate under 10xmagnification Inclusions and external blemishes hard to locate with naked eye Inclusions and external blemishes easy to locate with naked eye Heavy inclusions very easy to locate with the naked eye

I.F. V.V.S.I, V.V.S.2 V.S.1, V.S.2
Internally Flawless Very Very Slightly Included Very Slightly Included
Free from internal blemishes visible under 10xmagnification Inclusions and/or external blemishes very difficult to locate under 10xmagnification Inclusions and external blemishes difficult to locate under 10xmagnification
 
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