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How a diamond has been cut, polished, and to what proportions and symmetry, are of utmost importance since these factors determine the life, brilliance and dispersion of the diamond. If these cutting factors fall below standard, the appearance of the diamond will be adversely affected.

Many people confuse cut with the shape of a diamond. The shape you select is a matter of individual taste, and today your choice is only limited by the skill and imagination of the craftsmen. It is their efforts during every stage of the fashioning process that reflects the maximum amount of light back to the eye. Most round, brilliant-cut or fancy-shaped diamonds possess 58 carefully angled flat surfaces, called facets. It is the precision of each facet's placement that will affect the amount of fire, brilliance and ultimate beauty of your diamond.

The weight or size of a diamond is measured in carats. 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.

carat0.05 carat0.10 carat0.20 carat0.25 carat0.30 carat0.40 carat0.50 carat0.70
Carat 0.05 0.10 0.20 0.25 0.30 0.40 0.50 0.70
Øm/ m 2.5 3.0 3.8 4.1 4.5 4.8 5.2 5.8
h m/ m 1.5 1.8 2.3 2.5 2.7 3.0 3.1 3.5
carat0.90 carat1.00 carat1.25 carat1.50 carat1.75 carat2.00 carat2.50 carat3.00
Carat 0.90 1.00 1.25 1.50 1.75 2.00 2.50 3.00
Øm/ m 6.3 6.5 6.9 7.4 7.8 8.2 8.8 9.4
h m/ m 3.8 3.9 4.3 4.5 4.7 4.9 5.3 5.6

In order to grade the clarity of a diamond, it is necessary to observe the number and nature of any internal characteristics in the stone as well as their size and position. This analysis is carried out using the IGI scope and a loupe 10x under the experienced eye of laboratory gemologists. A diamond is said to be "Internally Flawless" when it presents no internal defects under 10x magnification.

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 10x magnification (small external details tolerated). Inclusions and/or external blemishes very difficult to locate under 10x magnification. Inclusions and external blemishes difficult to locate under 10x magnification.
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 10x magnification. Inclusions and external blemishes hard to locate with naked eye. Inclusions and external blemishes easy to locate with naked eye. Heavy inclusions located with naked eye.

Most diamonds of gem quality vary in shade from colorless to yellow. To determine the correct color, all submitted diamonds are compared to an internationally accepted master set of stones, the color of which ranges from D, or colorless (the most sought-after) to Z, the yellowest. Other colors occur in diamonds such as brown, orange, pink, blue, etc. The most intense of these shades are determined as "Fancy" colors and mentioned on the IGI Diamond Report.

 - F(1+) Colorless D Blanc Exceptionnel Exceptional White+
E Exceptional White
F Extra Blanc Rare White+
 - J(4) Near Colorless G Rare White
H Blanc White
I Blanc Nuancé Slightly Tinted White
 - M(7) Faint Yellow K Blanc Légèrement Teinté Tinted White
M Teinté Tinted
 - R(12) Very Light Yellow N
 - Z(20) Light Yellow S
Yellow U
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