SRK GRADING SYSTEM (SGS)
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It
has often been said that "Diamonds are
Forever." The timeless appeal of a diamond
is a testament to its durability, beauty,
rarity and strength. It is a fitting symbol
of love and affection. Let us offer you and
your dear one’s some guidelines to help
you choose the perfect diamond for your exquisite
engagement ring. |
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Diamond
Shape
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Does
your heart sing to the tune of light that
reflects out from a round brilliant cut diamond?
Perhaps your contemporary sensibility attracts
you to the princess cut, which is square in
shape, but brilliant like the round? Or do
you love the elegance of a marquise-shaped
diamond that marks your presence everywhere?
Each diamond shape has its own attribute.
Be it a pear shape, oval shape, heart shape,
cushion, emerald, escher or radiant, we have
it all. But shape preference is primarily
a subjective statement of style that reflects
the personality of the woman who wears it. |
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Detail
Description of 12 Grading Parameters
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SGS
following below parameters for pricing
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A
diamond’s weight is measured in 'carats'
and 'cents' with one carat equaling to 100
cents in the metric system and five grams
approximately equals to one carat. |
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Size Range |
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Size |
Size Range |
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+0.30 |
0.30 TO 0.399 |
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+0.40 |
0.40 TO 0.499 |
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+0.50 |
0.50 TO 0.699 |
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+0.70 |
0.70 TO 0.899 |
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+0.90 |
0.90 TO 0.999 |
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+1.00 |
1.00 TO 1.499 |
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+1.50 |
1.50 TO 1.999 |
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+2.00 |
2.00 TO 2.999 |
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+3.00 |
3.00 TO 3.999 |
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+4.00 |
4.00 TO 4.999 |
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+5.00 |
5.00 TO 5.999 |
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+6.00 |
6.00 TO 6.999 |
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+7.00 |
7.00 TO 7.999 |
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The
clarity of a diamond is based on the number,
location, size and type of inclusions found
in the stone. An inclusion is an imperfection
or trace mineral in the stone that is visible
under the magnification of a Grader's loupe.
The fewer the inclusions, the clearer, brilliant
and expensive the diamond will be. A "flawless"
diamond is the one that has no inclusions
and is extremely rare and valuable.
The clarity of a diamond refers to its inclusions,
which are some black, grey or white marks
that internally flaw the diamond’s structure.
These small imperfections are graded under
10x magnifying glass loupe, which is standard
to grade a diamond’s clarity. A diamond,
with fewer inclusions, is both rare and more
desired which also makes it more expensive.
A diamond with a purity of IF to VS2 will
sparkle with great intensity whereas diamonds
with a purity ranging between SI1 and SI2
will only sparkle. Diamonds between I1 and
I3 will lack any sparkle and life and its
inclusions will be noticeable to the naked
eye. All conditions being constant, lesser
the inclusions, greater the life and greater
the sparkle of a diamond. Thus, the more will
one pay for it. |
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We
grade diamonds on the basis of Purity by determining
following categories:
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Purity |
Description |
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FL |
Flawless |
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IF |
Inernally Flawless |
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VVS-1 |
Very Very Slightly Included-1 |
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VVS-2 |
Very Very Slightly Included-2 |
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VS-1+ |
Slightly Better than VS-1 |
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VS-1 |
Very Slightly Included-1 |
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VS-2+ |
Slightly Better than VS-2 |
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VS-2 |
Very Slightly Included-2 |
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SI-1+ |
Slightly Better than SI-1 |
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SI-1 |
Slightly Included-1 |
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SI-1- |
Slightly lower than SI-1 |
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SI-2+ |
Slightly Better than SI-2 |
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SI-2 |
Slightly Included-2 |
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SI-2- |
Slightly lower than SI-2 |
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SI-3+ |
Slightly better than SI-3 |
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SI-3 |
Slightly Included-3 |
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SI-3- |
Slightly lower than SI-3 |
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I-1+ |
Slightly better than I-1 |
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I-1 |
Included -1 |
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I-1- |
Slightly lower than I-1 |
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Additional Comment for Certified
stone.
1. If our (SGS) Clarity grading
is VS-2 and laboratory give us SI-1 certificate,we
have to specify the ,exclusive
clarity in the comment column
2. If our (SGS) clarity grading is SI-1
and the laboratory gives us a VS-2 certificate,
we have to specify the upgraded
clarity in the comment column.
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D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
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Though
colors fill life into life, in diamonds, the
case is just the opposite. Pick up any color
from the shade card and you will get the similar
shade in diamonds too. But it is very difficult
to get your hands on the one you desire the
most. Colorless diamonds are in greater demand
than the one’s available in the shades
of yellow. The thumb rule is - the whiter
the diamond, the better it is.
The yellow color in diamonds comes from the
traces of nitrogen found in them. One part
in a million will cause a yellow tint to appear
in the K color of diamonds. As a rule, yellower
the stone, lesser the value it has. There's
a good reason behind it. Yellower the stone,
lesser the sharpness and so, it appears dull.
A whiter stone allows greater amounts of light
to pass through it, making it sparkle and
shine. With the exception of a few natural
fancy colors like blue, pink, purple or red,
the more natural color a diamond has, the
lesser it is worth compared to its counterpart
colorless diamonds. |
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SGS Color Grades |
Parameters |
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D+ |
Colorless |
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D |
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D- |
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E+ |
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E |
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E- |
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F+ |
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F |
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F- |
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G+ |
Near Colorless |
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G |
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G- |
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H+ |
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H |
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H- |
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I+ |
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I |
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I- |
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J+ |
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J |
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J- |
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K+ |
Faint |
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Faint |
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K |
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K- |
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L+ |
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L |
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L- |
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M+ |
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M |
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M- |
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N to R |
Very Light |
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S to Z |
Light |
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Additional
Comments for Certified stones.
1. If our (SGS) color grading is G and the laboratory
gives us a H certificate, we have to specify
exclusive color
in the comment column.
2. If our (SGS) color grading is H and the laboratory
gives us a G certificate, we have to specify
upgraded color
in the comment column. |
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| THE
BROWN COLOR GROUP |
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1.Brown diamonds are simply colorless
diamonds that have a tint of brownish
body color.
2.We specify brown color of our (SGS)
grading system in comment column. |
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Years
ago, carat weight was considered to be the
defining characteristic of a diamond. Cut
is probably the most important and most challenging
of the four Cs to understand. The brilliance
of a diamond depends significantly on its
cut. Gemologists all over the world consider
Cut quality to be the most important diamond
characteristic because even if a diamond has
a perfect color and clarity, a diamond with
a poor Cut will have reduced brilliance. Cut
is not a shape of the diamond but it refers
to the quality of the proportion of the angle
with which the diamonds are cut to perfection.
When a diamond is cut to good proportions,
light is reflected from one facet to another
and is dispersed through the top of the diamond. |
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We grade diamonds on the basis of CUT by determining
following categories:
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SGS Cut Grades |
Description |
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EX |
Excellent Cut |
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VG |
Very Good Cut |
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G |
Good Cut |
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F |
Fair Cut |
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The
best proportionate round diamonds, with
perfect angles, will make it the most beautiful
diamond, called the “Hearts and Arrows”
(H&A). H&A are even better than
the excellent cut diamonds. H&A cut
commands a premium price in the market.
We grade H&A diamonds with extra specification
and do not include them in the regular cut
criteria. |
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Polishing
is a conclusion stage for the diamond manufacturing
process. Conclusion is a delicate process
as it has the ability to light up the whole
process. Similarly, polishing is a very delicate
process and requires utmost attention while
it is in the process. It influences the passage
of light through a diamond determining its
brilliance. |
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We grade diamonds on the basis of Polish by
determining following categories:
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SGS Polish Grades |
Description |
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EX |
Excellent Polish |
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VG |
Very Good Polish |
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G |
Good Polish |
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F |
Fair Polish |
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Symmetry
is an important element of diamond finish.
Symmetry refers to the exactness of the shape
and arrangement of facets. This includes naturals,
misshapen and extra facets, off-center culets
and tables, wavy and out-of-round girdles,
misalignment of crown and pavilion facets.
To the unaided eye, finish features usually
have little effect on appearance; they are
like pin point inclusions. The importance
of symmetry is of lesser consequence in diamonds
that have lower clarity grades whereas, it
is more important in diamonds that have high
clarity grades. |
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We grade diamonds on the basis of Symmetry by
determining following categories:
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SGS Symmetry Grades |
Description |
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EX |
Excellent Symmetry |
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VG |
Very Good Symmetry |
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G |
Good Symmetry |
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F |
Fair Symmetry |
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A
diamond is the most desired element in the
world. Luster is one of its two most valued
attributes, brilliance being the other one.
It is one of the most important parameters
of grading diamonds. It describes about the
fire, sparkle and scintillation of the diamond.
We at SGS, grade diamonds depending upon the
light reflected from it on the basis of two
levels of luster: |
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| Level
of Brilliance: |
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SGS Luster Grade |
Description |
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