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The 4Cs: ( 'C' for Cut)
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How a diamond has been cut, polished and to what proportion and symmetry are of utmost importance since these factors determine the life, brilliances and dispersion of the diamond. If these factors fall below standard, the appearance of the diamond will be adversely affected.
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'C' for Clarity:
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In order to grade the clarity of a diamond, it is necessary to observe the number and nature of any internal characteristics in the stone as well as their size and position. This Diamond Clarity Grading is carried out using the IGI scope and a loupe 10x under the experienced eye of laboratory gemologists. A diamond is said to be “Internally Flawless” when it presents no internal defects under 10x magnifications.
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'C' for Color:
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Most diamonds of gem quality vary in shade from colorless to yellow. To determine the correct color, al submitted diamonds are compared to an internationally accepted master set of stones the color of which ranges from D or colorless (the most sought after) to z, the yellowiest. Other colors occur in a diamonds such as brown, orange, pink, blue etc. The most intense of these are determined as “Fancy” colors and referenced on the IGI Diamond Report.
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'C' for Carat
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The weight or size of a diamond is measured in carats (ct.). A carat is 0.2 grams and there are 100 points (or 200 milligrams) per carat. With an accuracy of 1/100,000 ct. the IGI scales provide a highly precise diamond weight and this weight is specified on the Diamond Report to two decimal points.
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| Tolerance Chart: |
As mentioned in the table there is always a tolerance level in the Colour. Clarity & Carat weight in multiple diamond packaging.
For example”- If DEF (colour) is mentioned in the certificate it can be either D or E or F.
- If 0.05 cents (Carat) is mentioned in the certificate it will be between 0.04 cent to 0.06 cent.
- If VVS (Clarity) is mentioned in the certificate it can be either VVS1 or VVS2
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Tolerance Chart
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Color
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DEF |
D/E/F
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GHI
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G/H/I
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Clarity
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VVS
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VVS1 & VVS2
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VS
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VS1 & VS2
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SI
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SI1 & SI2
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Carat
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0.05
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0.04 – 0.06
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0.1
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0.08 – 0.12
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0.2
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0.18 – 0.22
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0.25
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0.26 – 0.27
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0.3
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0.28 – 0.32
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0.5
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0.48 – 0.52
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