Diamond Grading Chart
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
SLIGHTLY TINTED WHITE
K L M N-O P-R S-Z
.75 1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 7.00
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.
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
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.
Diamonds can be cut in various shapes (e.g. square,
pear or heart). The round brilliant is probably the
best known shape.
Antwerp - Beirut - Hong Kong - Istanbul - Mumbai - Shanghai
NBN EN ISO/IEC 17025 NBN EN ISO/IEC 17025
NBN EN ISO/IEC 17025