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Carat weight
Carat is a unit of measurement used to weigh diamond and gemstones. One carat is equal to 200 milligrams, or 0.2 grams. Large diamonds are rare and have a greater value per carat. Price of a diamond rises exponentially to its size.
Diamond color
Color grading for "colorless" or white diamonds involves deciding how closely a stone's body color approaches colorlessness. Most diamonds naturally occur with a trace of yellow or brown body color. Colorless diamonds act like prisms, separating white light passing through it into a wide spectrum of colors, causing a scintillating effect called "fire" which gives a diamond its brilliance. The whiter the diamond, better the fire.
The industry standard grading for diamond color is done referring to the GIA s professional scale that grades diamonds on a scale of D to Z. The scale begins with the highest rating of D for colorless, and travels down the alphabet to grade diamonds with traces of very faint yellowish or brownish hue.
D E F
G H I J
K L M
N O P Q R
S T U V W X Y Z
Colorless
Near colorless
Faint yellow
Very light yellow
Faint yellow
Cut
Cut does not mean shape of a diamond; it refers to the reflective and refractive quality of the stone. When white light enters a diamond it refracts, and disperses into different hues creating a scintillating effect called "fire". This gives a diamond its brilliance. Thus a well cut diamond allows light to enter, refracts light on its facets and reflects it back, exhibiting scintillation or fire of the diamond. In a poorly cut diamond, light enters through the table and due to the poor refractive index of the facets, light "leaks" out of the gem thus exhibiting a low brilliance.
Although, the variance in the proportions between an Ideal Cut and a Poor Cut can be difficult to discern, the industry standard for grading Cut helps in determining the quality of the Cut.
A cut can be classified as:
Excellent Cut/Ideal Cut
- This Cut maximizes the brilliance of a diamond. These stones exhibit high scintillation or fire and are one of the finest diamonds that money can buy.
Very Good Cut
- Usually cut to maximize the size of the diamond, a Very Good Cut stone falls a little short of the preferred diamond proportions. A Very Good Cut Diamond reflects most of the light that enters the stone, creating a good deal of brilliance.
Good Cut
- When a cutter chooses to create the maximum possible size diamond out of the rough crystal, the proportions of the stone fall out of the ideal range. These stones reflect much of the light that enters them exhibiting a good brilliance. Ideal choice for shoppers who want to stay in budget without sacrificing quality or beauty.
Fair and Poor Cut
- A diamond in this grade reflects only a small proportion of the light that enters it. These gems are created to maximize carat weight over other considerations.
Clarity
Diamonds are extracted from the crust of the earth and they naturally occur with flaws. Diamond clarity refers to the quality of diamonds relating to the existence of internal flaws called inclusions, or external flaws called blemishes.
Inclusions can be classified as the presence of a foreign material or structural imperfections such as tiny cracks that can appear whitish or cloudy. Blemishes are the surface defects of a diamond such as chips, nicks, polishes, grain boundaries etc. However, for grading purposes all flaws are called inclusions. The number, size, color, relative location and visibility of inclusions can all affect the relative clarity of a diamond. A clarity grade is assigned based on the overall appearance of the diamond under 10x magnification.
GIA´s diamond grading scale is the industry standard for grading diamond clarity
Category
Grade
Description
Flawless
FL
No internal or eternal flaws. Very rare and precious
Internally Flawless
IF
No internal flaws. Some minute external flaws. Again very rare and precious
Very Very Slightly Included
VVS1, VVS2
Minute inclusions, very difficult to detect under 10x magnification by a trained gemologist.
Very Slightly Included
VS1, VS2
Minute inclusions seen only with difficulty under 10x magnification.
Slightly Included
SI1, SI2
Inclusions visible under 10x magnification
Included
I1, I2, I3
Inclusions visible to the naked eye
Polish
Polish enhances the intensity of light reflected from, or refracted into and out of a diamond. Diamonds with poor polish are less brilliant because they have microscopic polish lines that blur the surface of the diamond. Polish of a diamond, as per GIA´s grading can be classified as:
Excellent:
No polish lines or marks are visible when the diamond is viewed under 10x magnification. The brilliance of diamond with excellent polish is noticeably different.
Very Good:
Represents diamonds that have one or two minor groupings of transparent polish lines that are visible under 10x magnification.
Good:
Some areas consisting of minor transparent lines are visible under 10x magnification. Occasional white polish lines may also be visible, but very limited in number.
Fair:
Several transparent or white polish lines are visible. Minor burn marks (visible only under 10x magnification) may be present.
Poor:
A significant number of heavy white polish lines and/or burn marks are visible on the surface of the diamond. Luster is minimal and the diamond may appear to be slightly cloudy in appearance.
Symmetry
Symmetry refers to the alignment of the facets of a diamond. Symmetry reflects the exactness of the shape and arrangement of facets of the diamond. When a diamond is polished, it may be slightly off round, have variations in girdle thickness, tilting of the table, and off centering the table or the culet etc.GIA has graded symmetry as:
Excellent / Ideal
- Flawless at 10x magnification
Very Good
- Flaws extremely difficult to locate under 10 x magnification
Good
- Flaws very difficult to see under 10x magnification
Fair
- Flaws noticeable under 10x magnification
Poor
- Flaws easy to see under 10x magnification, Visible to unaided eye
Very Poor
- Flaws relatively easy to see with the unaided eye
Extremely Poor
- Flaws obvious to the unaided eye
Angara Rating
Angara Rating refers to a unique, proprietary formula devised by Angara to determine a diamond s value.
Traditionally, diamond´s quality has been judged based on 4 Cs- color, cut, clarity, and carat. According to Angara rating, the 4 Cs are only a part of the picture not including other factors like size. Similarly there are many factors that determine the quality of the diamond such as: culet, fluorescence, girdle size, polish and symmetry apart from color, clarity and cut.
Angara rating analyzes a variety of different criteria including color, clarity, cut, culet, fluorescence, girdle size, polish and symmetry; accesses them as a whole to rate the quality of a diamond. The result is one score, on a scale of 0-100 that determines a diamond's overall quality, much like a Wine Spectator rating, or a Zagat Rating for wine (though those are on 30 points.)
Fluorescence
Fluorescence is an effect that is seen in some diamonds when they are exposed to long-wave ultraviolet light (such as the lighting frequently seen in dance clubs) or fluorescent light (such as the lighting frequently seen in a showroom). Under most lighting conditions, this fluorescence is not detectable to the eye. A diamond that has fluorescence has the tendency to emit soft colored glow when subjected to ultraviolet light. Diamonds with very strong fluorescence may appear to be less brilliant or even cloudy when exposed to UV lights. But such diamonds are very rare. While most gemologists prefer diamonds without this effect, some people enjoy it. It is a matter of what appeals to the aesthetics.
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CARAT WEIGHT
COLOR
CUT
CLARITY
CERTIFICATE
PRICE
1.02
I
Good
SI2
GIA
$3,086
Select/View
1.01
I
Good
SI2
GIA
$3,156
Select/View
1.01
I
Very Good
SI2
GIA
$3,224
Select/View
1.00
I
Good
SI2
GIA
$3,328
Select/View
1.01
H
Good
SI2
GIA
$3,347
Select/View
1.00
I
Very Good
SI2
GIA
$3,437
Select/View
1.00
I
Good
SI2
GIA
$3,443
Select/View
1.01
I
Very Good
SI2
GIA
$3,483
Select/View
1.01
I
Good
SI2
GIA
$3,483
Select/View
1.01
I
Very Good
SI2
GIA
$3,483
Select/View
1.01
I
Good
SI2
GIA
$3,496
Select/View
1.00
H
Very Good
SI2
GIA
$3,506
Select/View
1.01
H
Good
SI2
GIA
$3,512
Select/View
1.02
I
Very Good
SI2
GIA
$3,518
Select/View
1.12
I
Very Good
SI2
GIA
$3,541
Select/View
1.01
I
Very Good
SI2
GIA
$3,542
Select/View
1.03
I
Very Good
SI2
GIA
$3,552
Select/View
1.00
G
Very Good
SI2
GIA
$3,577
Select/View
1.00
E
Good
SI2
GIA
$3,593
Select/View
1.00
I
Good
SI1
GIA
$3,593
Select/View
1.01
I
Excellent
SI2
GIA
$3,600
Select/View
1.01
I
Very Good
SI2
GIA
$3,600
Select/View
1.00
I
Very Good
SI2
GIA
$3,607
Select/View
1.00
I
Very Good
SI2
GIA
$3,607
Select/View
1.01
G
Good
SI2
GIA
$3,612
Select/View
1.00
I
Very Good
SI2
GIA
$3,622
Select/View
1.01
I
Very Good
SI2
GIA
$3,657
Select/View
1.12
I
Excellent
SI2
GIA
$3,670
Select/View
1.07
I
Good
SI2
GIA
$3,691
Select/View
1.07
I
Good
SI2
GIA
$3,691
Select/View
1.02
E
Good
SI2
GIA
$3,697
Select/View
1.01
I
Good
SI2
GIA
$3,716
Select/View
1.00
I
Very Good
SI2
GIA
$3,722
Select/View
1.00
I
Very Good
SI2
GIA
$3,737
Select/View
1.00
I
Very Good
SI2
GIA
$3,737
Select/View
1.01
I
Good
SI1
GIA
$3,741
Select/View
1.11
I
Very Good
SI2
GIA
$3,746
Select/View
1.02
I
Good
SI2
GIA
$3,752
Select/View
1.00
H
Very Good
SI2
GIA
$3,761
Select/View
1.01
F
Good
SI2
GIA
$3,767
Select/View
1.01
I
Very Good
SI2
GIA
$3,773
Select/View
1.00
G
Good
SI2
GIA
$3,776
Select/View
1.00
I
Good
VS2
GIA
$3,781
Select/View
1.02
I
Excellent
SI2
GIA
$3,811
Select/View
1.01
I
Excellent
SI2
GIA
$3,823
Select/View
1.00
H
Good
SI2
GIA
$3,825
Select/View
1.01
I
Very Good
SI2
GIA
$3,832
Select/View
1.00
E
Good
SI2
GIA
$3,842
Select/View
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