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Education

4Cs

Here’s what you should consider before making a diamond purchase: Diamond Cut, Diamond Colour, Diamond Clarity, and Carat Weight.

At IAG laboratories, 3 diamond graders look at each of these diamond specifications. This is to ensure that we provide the most precise and unbiased information on every Diamond Report.

Cut  

4c cutWhile nature imbues each diamond with its distinguishing attributes of colour, clarity and carat weight, cut is the unique human contribution to the beauty of the diamond. It is also the most important attribute of a diamond, as the diamond cutter’s skill strongly influences the final carat weight, face-up colour and clarity, and overall appearance of the diamond,
A diamond cut to good proportions, regardless of its shape, will scintillate with fiery lights and maximum brilliance. A diamond which is cut too shallow or deep however, will lose light though the diamond’s base.


Color  


A diamond’s colour is dependent on the existence of impurities in its crystal structure, and is an important determinant of diamond quality and price. In fact, a single increase in colour grade could boost a diamond’s value by thousands of dollars.
Diamonds in the normal colour range are graded such that the fewer colours, the higher the grade, and the higher the value. The 4Cs colour scale ranges between D (colourless) and Z grades (light yellowish tint).
4c ColourAn exception to the rule is naturally coloured diamonds, also known as fancy diamonds. The brighter and purer the colour, the higher the value.

Clarity  

A diamond’s clarity is determined by the degree to which it is free from naturally occurring inclusions of minerals, often called “nature’s fingerprints”. Thus, the fewer the inclusions, the rarer and more valuable the diamond,
4c clarity

The number, type, colour, size, position of the “nature’s fingerprints” can affect a diamond’s value. However, most of theses are invisible to the naked eye.

Carat  

Diamonds are sold by weight, measured in carats. One carat, the equivalent of 0.2 grams, is divided into 100 points, so a diamond of 0.50 carat is commonly referred to as a 0.50-pointer.
4c carat
As expected, value increases with the size of the diamond. However, because larger diamonds are more rare, the price per carat becomes correspondingly higher the bigger the diamond.