Diamond Grading Chart printable pdf download

Diamond Grading Chart

Carat

The weight of a diamond is expressed in carats. One carat = 0.2 grams and one carat equals 100 points.

.05

.10

.15

.20

.25

.50

.75

1.00

1.25

1.50

1.75

2.00

2.50

3.00

4.00

5.00

7.00

Clarity

The clarity scale reflects the size, number, location and

All diamonds have traces of their growth history. In

visibility of the characteristics when examined with a

gem-quality diamonds, this concerns minute internal

loupe 10 X. The very best - and rarest - clarity is loupe

and external characteristics, graded under Clarity.

clean. Most inclusions, however, are not visible to the

naked eye. Diamonds that have no inclusions visible

to the unaided eye are also of excellent value.

VVS1

VVS2

VS1

VS2

SI1

SI2

Colour

Most diamonds are colourless to slightly yellowish. The

Diamonds can also occur in all sorts of colours, ranging

colourgrade is determined by comparison with a series

from brownish to striking yellows, pink to purple, red and

of masterstones, the best grade being colourless

blue. These are called “fancy colours”. Certain diamonds

can react to “black light” with grades varying from

(D, exceptional white +).

nil-slight-medium to strong. Besides colour, the fluores-

cence of the diamond is also graded.

N-O

P-R

S-Z

EXC.

RARE

WHITE

SLIGHTLY TINTED WHITE

TINTED WHITE

TINTED COLOUR

WHITE+

WHITE

WHITE+

WHITE

Cut

Shape

proportions & finish grade

Fire, brilliancy and

Diamonds can be cut in various shapes (e.g. square,

% Ø t

scintillation of a

pear or heart). The round brilliant is probably the

diamond are largely

best known shape.

% h c

determined by the

∂

% t d

proportions of various

GRIDLE

% h p

THICKNESS

parts of the stone.

Finish grade mainly

evaluates the

(100%)

ROUND

OVAL

MARQUISE

PEAR

symmetry.

GRIDLE

BRILLANT

THICKNESS

% Ø t

HEART

EMERALD

PRINCESS

RADIANT

NBN EN ISO/IEC 17025

Belgium - China - Hong Kong - India - Middle East

NBN EN ISO/IEC 17025

Diamond Grading Chart

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