The 4 C’s of Diamonds

CUT:

How a diamond has been cut, polished, and to what proportions, are of utmost importance - since these factors determine the life, brilliance, and luster of the diamond. If these cutting factors fall below standard, the appearance of the diamond will be adversely affected. The brilliant (or round) cut is the most popular, but other exquisite cuts are also highly prized.

CARAT:

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 I.G.I. scales provide a highly precise diamond weight and this weight is specified on the Diamond Report to two decimal points.

CLARITY:

In order to grade the clarity of a diamond, it is necessary to ascertain the number and nature of any inclusions in the stone as well as their size and position. This analysis is carried out using the IGIscope and a loupe 10x under the experienced eye of laboratory gemologists. A diamond is said to be "internally flawless" when it presents no internal defect under 10x magnification.

Clarity Grading Scale

F

flawless

IF

internally flawless

VVS-1 VVS-2

very, very slight inclusions

VS-1 VS-2

very slight inclusions

SI-1 S1-2

slight inclusions

I-1 I-2 I-3

imperfect

COLOR:

Most diamonds of gem quality vary in shade from colorless to yellow. To determine the correct color, all submitted diamonds are compared with 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 also in diamonds such as yellow, orange, pink, blue, etc. The most intense of these shades are determined as “fancy” colors and mentioned on the I.G.I. Diamond Report.

Color Grading Scale

D E F

colorless

G H I J

near colorless

K L M

faint yellow

N O P Q R

very light yellow

S T U V W X Y Z

light yellow