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Diamond Grading Chart 1

Diamond Grading Chart 1
Diamond Grading Chart 1
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
ED
RARE
WHITE+
F
RARE
WHITE
G
WHITE
H
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
Antwerp - Beirut - Hong Kong - Istanbul - Mumbai - Shanghai
www.hrdantwerp.be
NBN EN ISO/IEC 17025 NBN EN ISO/IEC 17025
www.hrdantwerp.be
NBN EN ISO/IEC 17025
Diamond Grading Chart 1
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