NVDiamonds: diamond sale, diamond cutting

Carat Weight

It is expressed in metric carats with an accuracy of two decimal places. One carat (1 ct) is equal to 0.20 gram. It means that a diamond weighting 1 gram has 5 carats. Precious Stones with high number of carats very rarely occur in nature.

CT

mm

0,05

2,5

0,10

3,0

0,20

3,8

0,25

4,1

0,30

4,5

0,40

4,8

0,50

5,2

0,70

5,8

1,00

6,5

1,25

6,9

1,50

7,4

2,00

8,2

Diamonds’ clarity

Inclusions are a characteristic feature of all precious stones. They are created deeply underground in the process of stone formation. They are often microscopic and cannot be seen with the naked eye. It is possible to determine its clarity only by observing a stone enlarged. The fewer inclusions the greater value of a diamond.

LC or FL

Loupe
clean

Loupe 10x

WS1

Very, very small inclusions

Loupe 10x

WS2

Very, very small inclusions

Loupe 10x

VS1

Very small inclusions

Loupe 10x

VS2

Very small inclusions

Loupe 10x

SI1

Small
inclusions

Loupe 10x

SI2

Small
inclusions

Loupe 10x

P1 or I1

Visible
inclusions

Naked eye

P2 or I2

Bigger
inclusions

Naked eye

P3

Big
inclusions

Naked eye

Diamonds’ colour

It is determined with the use of a special scale described with letters from D to Z. Generally diamonds which are whiter are closer to the begging of the scale, and their prices are higher. Prevailing majority of diamonds have minor yellow or brown tints. They are fully natural and considered typical colours. Absolutely colourless precious stones are the most rare and valuable.

D

E

F

G

H

I

J

K

L

M

N

O-P

Q-R

S-T

U-V

W-X

Y-Z

Diamonds’ cut

Diamonds can be divided into those with a brilliant cut and a fantasy cut, such as a heart, marquise or pear. It is the cut which makes an impression that diamonds shine. This shine is professionally called brilliance. This phenomenon occurs as a result of complete internal reflection and dispersion of the rays of light and their reflection from flat surfaces of a diamond i.e. facets. An experienced diamond cutter will polish a diamond so that it shines as brightly as it is possible.

Round

Square

Oval

Marquise

Pear

Emerald

Cushion

Triangle

Baquette

Heart