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Manufacturing
Manufacturing of diamonds is a very complex and time-consuming process. It requires a lot of human skills and modern machinery.
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Grading System
When the manufacturing process is completed over the rough diamonds, they are sent to grading department. Polished diamonds are graded.
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Knowledge
This section contains basics of diamonds and explanation of some advanced topics. We strongly recommend going through this section.
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When the manufacturing process is completed over the rough diamonds, they are sent to our grading department. Polished diamonds are graded by our experienced and expert graders. Our polished diamond grading department with most advanced tools, machinery and very knowledgeable graders. We understand that perfect information is very important to make a decision for diamond purchases. We constantly endeavor to provide as accurate information as possible so that our customers can make better decisions. Our grading is basically carried out taking into consideration four Cís, Clarity, Color, Cut, and Carat Weight. We also consider following parameters of a diamond as they provide very useful information about a diamond.

  • Luster
  • Fluorescence
  • Polish
  • Symmetry
  • Girdle
  • Culet

Our consistent and accurate grading system enables us to carry out E-Commerce, the new way of doing business in 21st century. We can provide very consistent and accurate information to our customers so that they can visualize and take decision sitting at any corner of the world.

The 4 Cís

Clarity:

Clarity Grading at JeelyDiamond clarity is a measure of a diamond's internal structural imperfections called "inclusions". There are very few flawless diamonds found in the nature, and the flawless diamonds are much more valuable. Clarity is very important factor in diamond pricing because it is directly related to its beauty. Clarity features can be divided into two parts, Internal features and external features. External features can be removed easily in most cases internal features can be removed only with weight-loss in diamond. Following points are considered when doing clarity grading.

  • Size and number of inclusions
  • Visibility of inclusions
  • Appearance of inclusion
  • Nature of inclusions
  • Position of inclusions
  • Type of inclusion
  • Influence on brilliance and durability of stone

The following is the chart of clarity grades we use in our grading system.

 Clarity  Description
 FL  Flawless
 IF  Internally Flawless
 VVS1  Very very small Included 1
 VVS2  Very very small Included 2
 VS1  Very Slightly Included 1
 VS2  Very Slightly Included 2
 SI1  Slightly Included 1
 SI2  Slightly Included 2
 SI3  Slightly Included 3
 I1  Included 1
 I2  Included 2
 I3  Included 3

Color:

The color of the diamond is one of their most important features because it strikes the human eyes most. The color has a major impact on diamondís price. The color of a stone partly depends on quantity and nature of inclusions. The colorless diamonds are very rare and much valuable. The color of the diamond is measured in the scale of D to R. Where D is considered almost colorless, as the color intensity increased, it is given grade E, F and up to R. Color more intense that R are considered fancy color. Accurate color grading is done with the help of master stones.

The chart for color grading is as follows:

 

 D, E  Colorless
 F, G  Rare white 
 H  White
 I, J  Rare white
 K  Slightly Tinted
 L, M, N  Very light yellow

Cut:

The cut of the diamond is one of the few things, which are in humanís hand in making a polished diamond. Cut is very important factor in diamond pricing because it is directly related to diamondís beauty. Brilliance and firing of the diamond is directly related to its cut. The cut quality is a complex parameter, which can be defined as a combination of Proportions, symmetry, and polish:

A stone shows the maximum brilliance and fire only when itís cutting proportions exactly correspond to those calculated from physical and optical laws.

When analyzing the cutting of the diamond, following points should be taken into consideration.

  • Table size evaluation
  • Crown angle evaluation
  • Examination of pavilion facet reflections
  • Girdle Evaluation
  • Estimation of pavilion depth
  • Estimation of culet size
  • Effect of proportions on stone value

Diamond cut is divided into following grades:

 ID  Ideal Cut
 EX  Excellent Cut
 VG  Very Good Cut
 GD  Good Cut
 FR  Fair Cut

Carat Weight:

Diamond weight is measured in carats. A carat is a unit of weight. Carat weight is one of the most important factors in deciding price of the stone. The weight of the diamond is taken into consideration first when analyzing the diamond. Carat is most commonly abbreviated as ďctĒ. The weight of a diamond is generally indicated to the second decimal point. For example if the weight of a diamond is one and quarter that means 1.25 ct.

1 carat = 0.2 gram= 100 points

Carat is the simplest and most objective of the four C's. Naturally more Carat weight means more cost because BIG diamonds are very rare.

 

 

 

 

Luster:

Luster describes the quantity and quality of light reflecting from the surfaces of a diamond. Luster is very important and useful parameter which tells the quality of light from surface of the diamond. It also tells about sparkle and brilliance of a diamond.

 EX  Excellent
 VG  Very Good
 GD  Good
 FR  Fair

Fluorescence:

Fluorescence is a form of lumination that is created when a diamond is exposed to low or high wave ultraviolet radiation. Faint fluorescence will rarely detract from a diamond's beauty and cannot normally be seen or separated by the naked eye. Strong fluorescence can sometimes improve the appearance of diamonds that possess color.

We grade fluorescence as follows:

  • None
  • Faint
  • Medium
  • Strong

Polish:

Polishing is the final step in the diamond manufacturing process. Polish influences how well light is able to pass through a diamond and is very important to a diamond's brilliance. Diamonds that have poor to extremely poor polish are less brilliant because they have microscopic polish lines that blur the surface of the diamond. These polish lines reduce the amount of light that enters or exits a diamond.

 EX  Excellent
 VG  Very Good
 GD  Good

Symmetry:

Symmetry is the arrangement of the facets and finished angles created by the diamond cutter. The small variations can include misalignment of facets or facets that fail to point correctly to the girdle (this misalignment is completely undetectable to the naked eye). Excellent symmetry of a well-cut and well-proportioned diamond can have a great effect on the diamond's brilliance and fire. Symmetry is regarded as an indicator of the quality of as diamond's cut; it is graded as follows.

 EX  Excellent
 VG  Very Good
 GD  Good
 FR  Fair

Girdle:

The girdle is the outer edge of the diamond between the crown and the pavilion. The girdle thickness plays important role in diamonds beauty. Girdle is graded based on its thickness.

We grade girdle as follows

  • Extremely Thin
  • Thin
  • Medium
  • Slightly Thick
  • Thick
  • Very Thick
  • Extremely Thick

Culet:

Culet is a point at the very bottom of the pavilion of a diamond. It is a very small surface, cut parallel to the plane of the table, on the point of the stone, which it is intended to protect it from damage. We grade culet as follows:

  • None
  • Very Small
  • Small
  • Medium
  • Thick
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