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GRADING SYSTEM
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Below is the detail description of the 12 Grading Parameters that we follow:
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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. Our diamonds for sale range from +0.30 to +7.00.
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Size Range
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Size
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Size Range
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+0.30
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0.30 To 0.399
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+0.40
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0.40 To 0.499
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+0.50
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0.50 To 0.699
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+0.70
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0.70 To 0.899
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+0.90
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0.90 To 0.999
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+1.00
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1.00 To 1.499
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+1.50
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1.50 To 1.999
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+2.00
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2.00 To 2.999
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+3.00
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3.00 To 3.999
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+4.00
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4.00 To 4.999
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+5.00
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5.00 To 5.999
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+6.00
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6.00 To 6.999
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+7.00
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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. Doing wholesale diamond business for such flawless diamonds
is very prestigeous to any diamond merchant.
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. It is rare to find such diamonds for sale.
Wholesale Diamonds and individual diamonds are graded on the basis of Purity by determining following categories:
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Purity
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Description
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FL
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Flawless
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IF
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Inernally Flawless
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VVS-1
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Very Very Slightly Included-1
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VVS-2
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Very Very Slightly Included-2
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VS-1
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Very Slightly Included-1
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VS-2
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Very Slightly Included-2
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SI-1
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Slightly Included-1
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SI-2
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Slightly Included-2
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The thumb rule usually is - the whiter the diamond, the better it is. Colorless
diamonds are in greater demand than the one’s available in the shades of yellow.
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 diamonds for sale has, the lesser it is worth compared to its counterpart
colorless diamonds for sale .
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SGS Color Grades
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Parameters
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D
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E
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F
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G
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H
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I
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J
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K
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L
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M
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N to R
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Very Light
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S to Z
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Light
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Diamonds from the Brown Color Group:
Brown diamonds are simply colorless diamonds that have a tint of brownish body color.
We specify brown color of our (SGS) grading system in comment column for our complete range of wholesale diamond.
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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. 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. Availablity of high brilliance
diamonds for sale is rare and thus expensive.
Diamonds are graded on the basis of CUT by determining following categories:
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SGS Cut Grades
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Description
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EX
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Excellent Cut
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VG
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Very Good Cut
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G
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Good Cut
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F
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Fair Cut
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Diamonds are graded on the basis of Polish by determining following categories:
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SGS Polish Grades
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Description
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EX
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Excellent Polish
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VG
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Very Good Polish
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G
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Good Polish
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F
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Fair Polish
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Symmetry refers to the exactness of the shape and arrangement of facets. This term is very popular in wholesale diamond industry.
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.
Diamonds are graded on the basis of Symmetry by determining following categories:
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SGS Symmetry Grades
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Description
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EX
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Excellent Symmetry
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VG
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Very Good Symmetry
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G
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Good Symmetry
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F
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Fair Symmetry
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In wholesale diamond industry, the Level of Brilliance in diamonds are graded on the following basis:
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SGS Luster Grades
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Description
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EX
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Excellent Luster
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VG
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Very Good Luster
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GD
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Good Luster
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FR
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Fair Luster
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Level of Milkiness in diamonds for sale are graded on the following basis:
Milkiness is an effect that we get looking at the diamonds due to some inclusions
like clouds present in the diamond. These avoid reflection of light from the diamond.
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SGS Milky Grades
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Description
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ML-1
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Slightly Milky
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ML-2
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Medium Milky
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ML-3
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Heavy Milky
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Fluorescence in diamonds is graded on the following basis:
Fluorescence, when exposed to ultraviolet radiations, glows if it carries the characteristic
of fluorescence. One of the important processes of various other processes in wholesale diamond, sorting such diamonds is one.
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SGS Fluorescence Grades
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Description
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N
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None Fluorescence
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FNT
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Faint Fluorescence
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MED
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Medium Fluorescence
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STG
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Strong Fluorescence
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VST
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Very Strong Fluorescence
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Black Inclusion (Natts) in diamonds are graded on the following basis:
Black Inclusions or Natts in general, are the inclusions that are found in the diamonds.
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SGS Black Inclusion
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Description
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N
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None
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B_PP
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Pin Point Black Inclusion
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B-1
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Minor Black Inclusion
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B-2
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Medium Black Inclusion
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We generally specify two parts of the black inclusions:
(i) Table black inclusions
(ii) Side black inclusions
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Most of the wholesale diamond merchants grade diamonds on the basis of five types of inclusions such as, Pin Points (PP),
Clouds (CLD), Crystals (CRL), Feathers (FR) & Spreaded (SPR), and then diamonds for sale are categorised accordingly.
Pin Point (PP): It is a very small crystal that looks like a tiny dot while
using a 10 x loupe. Pin Points are generally white in color but occasionally they
can be dark also.
Feather (FR):
A feather is a general term for any break in the diamond.
Clouds (CLD):
A cloud consists of many tightly grouped pin points. Some clouds look like a light
haze, while others are dense and almost impossible to see through the naked eye.
Crystal (CRL): It is a mineral crystal contained in some diamonds. A crystal
can be of almost any size, colored or colorless, and can appear alone or in groups.
Spreaded (SPR):
A spreaded inclusion appears when the feather inclusions are in greater number,
spread across and not grouped together.
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SGS Other Inclusion
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Description
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N
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None
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PP-1
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Pin Point Minor Inclusion
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PP-2
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Pin Point Medium Inclusion
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CRL-1
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Crystal Minor Inclusion
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CRL-2
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Crystal Medium Inclusion
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SPR-1
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Spreaded Minor Inclusion
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SPR-2
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Spreaded Medium Inclusion
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SPR-3
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Spreaded Heavy Inclusion
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FR-1
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Feather Minor Inclusion
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FR-2
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Feather Medium Inclusion
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FR-3
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Feather Heavy Inclusion
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CLD-1
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Cloud Minor Inclusion
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CLD-2
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Cloud Medium Inclusion
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CLD-3
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Cloud Heavy Inclusion
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We generally specify two parts of other inclusions:
(i) Table other inclusions
(ii) Side other inclusions
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Open Inclusions are the inclusions that are on the surface of the diamonds. Wholesale dimaond merchants grade
diamonds with open inclusions on the basis of five types that are mentioned below:
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SGS Open Inclusion
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Description
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N
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None
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HL
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Hair Line Open Inclusion
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SM
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Small Open Inclusion
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MD
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Medium Open Inclusion
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HV
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Heavy Open Inclusion
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We generally specify two parts of open inclusions:
(i) Table open inclusions
(ii) Side open inclusions
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Extra facet is that extra facet placed on the normal facets of the diamonds without
considering the symmetry of the diamond. These facets are additional to those required
for making the diamond a brilliant cut diamond.
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SGS Extra Facets Grade
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Description
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N
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None
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P_SM
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Pavilion Small
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P_MD
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Pavilion Medium
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P_MJ
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Pavilion Major
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P_HV
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Pavilion Heavy
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C_SM
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Crown Small
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C_MD
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Crown Medium
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T_SM
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Table Small
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Below are extra specifications for the internal graining in the comment column:
(i) Slight Internal Graining
(ii) Heavy Internal Graining
Only after complete assurance of above mentioned gradings, we make diamonds for sale available to our valued clients.
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