How to Buy a Diamond – The Four C’s

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.

ani4c
 

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 gem laboratory 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

w m/ 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

w m/ 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 GIA 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

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 darkest. Other colors occur in diamonds such as brown, orange, pink, blue, etc. The most intense of these shades are determined as “Fancy” colors.

 

 

GIA or EGL

Description

 

D(0+) - F(1+)

Colorless

D

Exceptional White+

 

E

Exceptional White

 

F

Rare White+

 

G(1) - J(4)

Near Colorless

G

Rare White

 

H

White

 

I

Slightly Tinted White

 

J

 

K(5) - M(7)

Faint Yellow

K

Tinted White

 

L

 

M

Tinted

N(8) - R(12)

Very Light Yellow

N

 

O

 

P

 

Q

 

R

 

S(13)

Light Yellow

S

T

 

Yellow

U

 

V

 

 

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1 Comment

  • sexe amateur / January 19, 2017 at 9:15 pm

    Greetings! Very useful advice within this article! It’s the little changes that make
    the most significant changes. Thanks for sharing!

    Reply