Carat

Cut

Clarity

Color


Carat

The unit of measurement used to describe the weight of diamonds is called 'Carat'. The 'Carat' weight is commonly expressed in points or fractions.

1 carat is equal to 0.2 grams, or 0.007 ounces.
5 carats is equal to 1 gram.
141.7 carats is equal to 1 ounce.
There are 100 points in 1 carat. For instance, 0.33 carats is generally expressed as 33 points, or 1/3 of a carat.

Carat means weight of diamond which reflects its size. One carat diamond weighs 100 cents.
(1 ct = 100 cents ) Diamond sizes can be expressed by its weight (unit), pointers or stones per carat.

Price consideration with Size Range.

Weight (unit): 1ct=100 cents 5cts = 1.000gms

0.15
0.15 - 0.17
0.18
0.18 - 0.22
0.23
0.23 - 0.29
0.30
0.30 - 0.39
0.40
0.40 - 0.44
0.46
0.45 - 0.49
0.50
0.50 - 0.59
0.60
0.60 - 0.69
0.70
0.70 - 0.74
0.75
0.75 - 0.79
0.80
0.80 - 0.89
0.90
0.90 - 0.99
1.00
1.00 - 1.19
1.20
1.20 – 1.49
1.50
1.50 – 1.69
1.70
1.70 – 1.99
2.00
2.00 – 2.99
3.00
3.00 – 3.99
4.00
4.00 – 4.99
5.00
5.00 AND ABOVE

CUT (PROP)

Diamond's beauty depends upon optical properties such as high Refractive index, color dispersion, luster & high degree of clarity. We give strong thrust on cut grading. Due to well equipped manufacturing system our stones are best polished. Luster means fire of diamonds. Better the Polish, brighter & more lustrous the stone. At the time of cutting take care that the light entering from top should not be lost through the teak pavilion sides. So Customer gets to observe almost 100% light from a round brilliant cut diamond. i.e. (82-83% from total internal reflection & 17 -18 % from luster). This phenomenon is known as "LIFE". As diamond critical angle is 24*, brilliance of diamond depends upon pavilion facets & pavilion angle. Cut determines brilliance. In RBC diamond Crown facets act like small prism, which split white light. Small crown gives less Dispersion & more Brilliance vice versa.

Lay people often confuse a diamond's SHAPE with its CUT; this is most likely due to the industry's synonymous use of the terms "cut" and "shape" to describe a diamonds shape (outline), i.e. marquise cut, round brilliant cut, or pear shape. In reality when we refer to the "cut" or "make" of a diamond, we are really referring to a compilation of three factors. It’s PROPORTIONS in terms of degrees and percentages... the quality of its POLISH or finish... and the SYMMETRY of its facets... These three factors result in the "Overall Cut Grade" of the diamond.

Code Description Image
(ID) IDEAL Ideal cut diamonds are round diamonds that have been cut to exact, mathematical proportions. It must be symmetrical, and have 58 facets, placed exactly according to formula. These diamonds are cut to maximize the brilliance and sparkle of the stone.
(EX+) EXCELLENT+
(EX) EXCELLENT
This cut is intended to maximize brilliance and is as near to ideal proportions as possible. The typically smaller table sizes of these diamonds have the added benefit of creating a great deal of dispersion - or 'fire' - as well.
(VG+) VERY GOOD+
(VG) VERY GOOD
This cut deviate slightly from the Excellent cut proportions in order to create a larger diamond. However, diamonds in this category reflect the majority of the light that enters them, creating a good deal of brilliance
(GD+) GOOD+
(GD) GOOD
Diamond in this category will reflect much of the light that enters them. Their proportion falls outside of the preferred range because the cutter has chosen to create the largest possible diamond. Good cut diamonds offer an excellent cost-saving without sacrificing quality or beauty.
(FR+) FAIR+ (FR) FAIR A diamond graded as Fair will be cut to a lower standard that reflects only a small proportion of the light that enters it as compared to Good cut diamonds, losing fire and brilliance.
Clarity Grade | Table Inclusion | Black Inclusion | Opens | Type of Inclusion | Knot | Graining | Eye Clean

Clarity Grade

A diamond's clarity refers to the presence of identifying characteristics on and within the stone. While most of these characteristics are inherent qualities of the rough diamond, and have been present since the earliest stages of the crystal's growth below ground, a few are actually a result of the harsh stress that a diamond undergoes during the cutting process itself.

Code - Shade Description Image
FL Flawless Diamonds in this range have no inclusions, neither internal nor external.
IF Internally Flawless No internal inclusions visible with 10x magnification. There may be some tiny external irregularities in the finish.
VVS1 Very very slightly included 1 Extremely difficult to see the inclusion. Even difficult to spot by trained eyes with 10 x.
VVS2 Very very slightly included 2 Still difficult to see the inclusions with 10x magnification but easier than VVS1.
VS1+ Better than VS1 Slightly better than VS1.
VS1 Very slightly included 1 Little difficult to see the inclusions with 10x magnification.
VS2+ better than VS2 Slightly better than VS2
VS2 Very slightly included 2 Very small inclusions visible with 10x magnification
SI1+ better than SI1 Slightly better than SI1.
SI1 Slightly included 1 Small inclusion visible with 10x magnification.
SI1- lower than SI1 Slightly lower than SI1
SI2+ better than SI2 Slightly better than SI2
SI2 Slightly included 2 Small inclusions easily visible with 10x magnification.
SI2- lower than SI2 Slightly lower than SI2..
SI3+ better than SI3 Slightly better than SI3.
SI3 Slightly included 3 Inclusions that may be visible to the naked eye for a trained observer
SI3- Slightly lower than SI3 Slightly lower than SI3.
I1+ better than I1 Slightly better than I1
I1 Included 1 Inclusions that may be easily visible to the naked eye for a trained observer.
I1- lower than I1 Slightly lower than I1
I2+ better than I2 Slightly better than I2.
I2 Included 2 Many flaws clearly visible to the naked eye that also decrease the brilliance
I2- lower than I2 Slightly lower than I2.
I3+ better than I3 Slightly better than I3.
I3 Included 3 Many flaws clearly visible to the naked eye which decrease the brilliance and compromise the structure of the diamond, making it more easily cracked or chipped.
I3- lower than I3 Slightly lower than I3.
Table Inclusion (TI)

To enhance our clarity grading we introduce a new factor i.e. Table Inclusion (TI). This can be Black or white inclusion on table in proportion to the clarity

Code Description Image
T0 - CENTER CLEAN It doesn’t have any inclusion in table.
T1 - MINOR This inclusion is not easily visible in table and it is dependent on the clarity grade.
T2- MEDIUM There is Slight presence of inclusion in table. It is partially visible and dependent on the clarity grade.
T3 - MAJOR They are moderately included in table. It is visible and dependent on the clarity grade.
T4 - HEAVY Inclusion is found in abundance in table. It is easily visible and dependant on the clarity grade. It affects the pricing of the diamond extensively.

These ratings are dependent on the maximum inclusions for every diamond in each clarity grade and are visible with 10X magnification.

Black Inclusion Proportion: Natts (BI)

This term is used to indicate the amount of black inclusions as compared to the total inclusions in the diamond.This is sub divided in two parts 1: BIC = BLACK IN CENTER ,2: BIS = BLACK IN SIDE

Black Inclusion On Center (BIC)

Code Description Image
White Inclusions -
Black inclusions
-  
B0-NOT VISIBLE This black inclusion is not easily visible and it is dependent on the clarity grade.
B1-MINOR There is a Slight presence of black inclusion. This inclusion is partially visible and it is dependent on the clarity grade.
B2-MEDIUM There is moderation of black inclusion. This inclusion is easily visible and it is dependent on the clarity grade.
B3-MAJOR Black inclusion is found in abundance. These inclusion are very easily visible and it is dependent on the clarity grade. They affect the pricing of the diamond extensively.
B4-HEAVY Black inclusions are plenty and are clearly visible. They are instrumental in pricing of the diamond.

These ratings are dependent on the maximum Black inclusions for every diamond in each clarity grade and are visible with 10X magnification



Black Inclusion on Side (BIS)



Code

Description Image
White Inclusions -
Black inclusions
-  
B0-NOT VISIBLE This black inclusion is not easily visible and it is dependent on the clarity grade.
B1-MINOR There is a Slight presence of black inclusion. This inclusion is partially visible and it is dependent on the clarity grade.
B2-MEDIUM There is moderation of black inclusion. This inclusion is easily visible and it is dependent on the clarity grade.
B3-MAJOR Black inclusion is found in abundance. This inclusion is very easily visible and it is dependent on the clarity grade. They affect the pricing of the diamond extensively.
B4-HEVY Black inclusion is plenty and is clearly visible. They are instrumental in pricing of the diamond.
These ratings are dependent on the maximum Black inclusions for every diamond in each clarity grade and are visible with 10X magnification.


Opens (OP)

This term is used to indicate open position in diamond if there is any open on the surface of diamonds. This is subdivided in three parts: - (1) OPTA = Open on Table, (2) OPCR = Open on Crown, (3) OPPV = Open on Pavilion.

Open on Table (OPTA)

Code Description
(O1) – VERY SMALL Difficult to see and it is dependent on the clarity grade.
(O2) – SMALL Easy to see as compared to very small and it is dependent on the clarity grade.
(O3) - HEAVY Easily seen and it is dependent on the clarity grade.

Open on Crown (OPCR)

Code Description
O1 – VERY SMALL Difficult to see and it is dependent on the clarity grade.
O2 – SMALL Easy to see as compared to very small and it is dependent on the clarity grade.
O3- HEAVY Easily seen and it is dependent on the clarity grade.

Open on Pavilion (OPPV)

Code Description
O1 – VERY SMALL Difficult to see and it is dependent on the clarity grade.
O2 – SMALL Easy to see as compared to very small and it is dependent on the clarity grade.
O3 - HEAVY Easily seen and it is dependent on the clarity grade.

These ratings are dependent on the maximum Open for every diamond in each clarity grade and are visible with 10X magnification.

Types of Inclusion (TOI)

Types of Inclusion depend upon the intensity of concentration of inclusion in entire diamond and ease of its visibility in diamonds.

Code Description Image
(A) Very Light of Soft This inclusion is very soft and very light and has extremely low concentration and dependant on clarity grade.
(B) Soft This inclusion is soft and light and has low concentration and dependant on clarity grade.
(C) Normal This inclusion is reasonably concentrated. Clearly visible and dependant on clarity grade.
(D) Hard This is highly concentrated. Prominently visible and dependant on clarity grade.
(E ) Very Hard Very Highly concentrated inclusion. Very prominently visible and dependant on clarity grade.

These ratings are based on the presence and intensity in the entire diamond considering the clarity grade with 10x magnification.


KNOT

A "knot" is an included diamond crystal that extends to the surface of the diamond. In other words, it is a diamond crystal which reaches the polished surface of a finished diamond. With proper lighting and magnification you may be able to see the boundary between the knot and the diamond which contains it. Knots sometimes resemble raised areas on a facet surface or group of facets. Differences in the polish quality may be visible on the surface of the knot and the facet where it is located. We typically reject diamonds for this characteristic because we feel that knots provide a potential durability risk to the longevity of the diamond. The first picture below shows a knot as seen through our Gem Scope using a normal light source; we diffused the light source for the second picture to provide you with a different perspective of the inclusion.



Code Description
Y – YES KNOT is present in diamond.


Graining

Graining is divided in to two parts namely Internal graining (IG) and surface graining (SG). Internal inclusion of irregular crystal growth may appear milky like faint lines or streaks, or may be colored or reflective. The inclusions or graining that appears on the surface of the diamond is known as surface graining.

The comment on a lab report indicating "Internal Graining Not Shown" should not be reason for alarm because it refers to clarity characteristic which is usually not readily visible without the use of extremely high magnification. Internal Graining should not be considered an "absolute characteristic" because the visibility depends on the lighting conditions and the specific angle by which the diamond is being evaluated. It might be visible to an experience diamond grader who is examining the diamond under laboratory conditions, but may never be detected by other people. Essentially internal graining refers to part of the grain structure of the diamond which was visible as a kind of transparent line to the grader. The degree of the visibility of the grain lines will have an effect upon the clarity grade of the diamond and if no other clarity characteristics are present then the graining may be the basis for the clarity grade of the diamond. For instance, a diamond that contained small diamond crystals which by themselves would warrant a clarity grade of VS-1 might be graded as a VS-2 if internal graining were present. However another diamond that did not contain the diamond crystals might be graded as VVS-2 if the grade is based upon internal graining and the comment "clarity grade based upon internal graining" would appear under the "comments" section of the lab report while nothing is indicated under the "keys to symbols" by the plotting diagram. This series of photographs shows the very subtle effect of internal graining as seen within a diamond we purchased for inventory at various degrees of magnification. Notice how the internal graining is not readily visible in the first picture which was taken using a magnification level of about 20x. The internal graining is barely visible in the next two photographs which were taken of the table facet at about 40x magnification, the grain line appears as a kind of translucent line as indicated by the light blue arrows. We increased the magnification substantially for the remaining pictures which show the internal grain line as seen through our Gem Scope using normal and diffused light sources.

Code Description
IG – Internal Graining Diamond has internal graining
SG- Surface Graining Diamond has surface graining

Eye Clean

Code Description Image
E1 – Eye Clean Diamond that has no inclusion visible to the naked eye. We describe it in clarity grade SI1 and down. Stones having clarity VS2 and above always falls in this criteria.
E2 – Semi Eye Clean These diamonds have inclusions which are visible to trained naked eyes as compared to Eye Clean diamonds.

These ratings are dependent on the maximum inclusions for every diamond in each clarity grade and visible with naked eye.

Color Scale | Color Shade | Fancy Colored Diamond
Color Scale


Diamonds act as prisms, dividing light into a spectrum of colors and reflecting this light as colorful flashes referred to as a diamond's 'fire'. The more colorless a diamond is, the more vividly colorful the 'fire' will appear.

Diamonds come in every color of the spectrum, but the most popular gems are colorless. Truly colorless, icy-white diamonds are extremely rare, and therefore, most costly. Stones are graded by color and given designations dependent on how far they deviate from the purist white.

The best way to see the true color of a diamond is by looking at it against a white surface. Although the majority of diamonds come in shades of white, the gems also come in a spectrum of majestic colors, from red and canary yellow to blue, green and brown. These colorful diamonds, known as fancies, are valued for their depth of color, just as white diamonds are valued for their lack of color.

Grades in the color of diamonds range from D - Z. D is being truly colorless and of the highest quality. E and F are also graded as colorless while G, H, I and J are near colorless. Diamonds graded K, L and M will have obvious hints of color and as the scale approaches P, you may find subtle changes in hue and tone. The exceptions to the rule are 'Fancy' diamonds in well-highlighted colors that include pink, blue, red, green
and canary yellow. These are particularly rare and highly treasured.

Types of color

D Absolutely colorless. The highest color grade, which is extremely rare.


E+ Colorless nearly to D color
E Colorless. Only minute traces of color can be detected by an expert gemologist. A rare diamond.

F+ Colorless nearly to E color

F Colorless, Slight color detected by an expert gemologist, but still considered a 'colorless' grade. A high-quality diamond.

G+ Colorless nearly to F color

G Near-colorless. Color noticeable when compared to diamonds of better grades, but these grades offer excellent value.
H+ Near colorless close to G color
H Near-colorless. Slightly off-white when compared to diamonds of better grades but these grades offer excellent value.
I+ Near colorless close to H color

I Off-white when compared to diamonds of better grades. Color slightly detectable. A very good value stone.
j+ Off-white diamond but close to I color.
j Light color detectable with 10x diamond loupe. A very good value stone.
k+ This diamond is very close to J color diamond but not exactly J color
k Light color detectable by the naked eye. A very good value stone.
L+ This diamond is very close to K color diamond but not exactly K color
L Noticeable color. The color is detectable by the naked eye. A very good value.
M+ This diamond is very close to L color diamond but not exactly L color diamond
M Clearly visible color. Detectable with naked eyes. A very good value.
N+ Clearly visible color. Detectable with naked eyes. A good value.
N This diamond is very close to N+ color diamond but not exactly N+ color diamond
O+ Clearly visible color. Detectable with naked eyes.
O This diamond is very close to O+ color diamond but not exactly O+ color diamond