Fillable Printable Best Diamond Grading Chart Template

Best Diamond Grading Chart Template

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

EXC.

WHITE+

EXC.

WHITE

RARE

WHITE+

RARE

WHITE

SLIGHTLY TINTED WHITE

I J

TINTED WHITE

K L M N-O P-R S-Z

TINTED COLOUR

.75 1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 7.00

Clarity

All diamonds have traces of their growth history. In

gem-quality diamonds, this concerns minute internal

and external characteristics, graded under Clarity.

The clarity scale reflects the size, number, location and

visibility of the characteristics when examined with a

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

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.

Colour

Most diamonds are colourless to slightly yellowish. The

colour grade is determined by comparison with a series

of masterstones, the best grade being colourless

(D, exceptional white +).

Diamonds can also occur in all sorts of colours, ranging

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

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

can react to “black light” with grades varying from

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

cence of the diamond is also graded.

LC VVS1 VVS2 VS1 VS2 SI1 SI2 P1 P2 P3

HEART RADIANTEMERALD PRINCESS

ROUND

BRILLANT

OVAL PEARMARQUISE

Cut

The proportions are determinative for the brilliancy

and the fire of the diamond. The symmetry describes

the variations of the different parameters which define the

proportions. The polish describes the finish of the facets.

Shape

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

pear or heart). The round brilliant is probably the

best known shape.

NBN EN ISO/IEC 17025