15 January 2019
The four things you should know to perceive the quality of a diamond
The four things you should know to perceive the quality of a diamond

Do you want to know what determines the value or the price of a diamond? Do you want to know why diamonds with a similar appearance, at first glance, are different valued? If the answer is ‘’yes’’ this article is made for you.

It is a known fact that there is no diamond with the same characteristics. Every diamond is unique. Diamonds come in different colors, clarities or shapes. All polished diamonds are valuable, but, that value depends on the combination of the different factors.

Jewelry professionals use a systematic way to evaluate these factors: GIA system, which summarize the usage of four factors to describe and classify diamonds: Clarity, Color, Cut, and Carat Weight.

These are known as the 4Cs. The 4C describe the individual qualities. The terms used to describe the 4C have become part of an international and known language that jewelers use to evaluate diamonds.


The subtle color differences affect substantially the value of a diamond. Two diamonds of the same clarity, weight, and cut can differ in values ​​based only on color.

Diamond Color Graph

There are different colors of diamonds. Diamonds ranging from colorless to light yellow and brown fall within the normal color range. Within this range, the colorless diamonds are the rarest, so they are the most valuable.

Diamond Color Scale


Diamonds have internal traits, called inclusions and superficial irregularities, called blemishes. Clarity is the relative absence of inclusions and blemishes.

Diamond Clarity Graph

Clarity features can have a negative influence on the value of a diamond, but they can also have positive effects.

Flawless diamonds are very rare, it is possible to spend a lifetime in the jewelry industry and never having seen it, and they command top prices.

At the other end of the scale are diamonds with inclusions that can be easily seen at first glance. Between the two ends are diamonds with visible inclusions only with an increase of 10x.

Jewellers use different terms to reference the clarity of a diamond very very slightly imperfect, very slightly imperfect, slightly imperfect, and imperfect. In recent years, the term imperfect has been replaced with included.


When a diamond interacts with the light, the amount of light that is returned to the eye is determined according to each angle of the diamond.

Gems shape

A diamond’s proportions determine how light performs when it enters the diamond. Depending on the route of the light through the diamond, it will look darker and unattractive or lighter. Diamonds with a good polish optimize the light better and they will be brighter.

Generally, as higher is the cut of a diamond, brighter is the diamond. The term "cut" can also describe a fashionable diamond shape, all the shapes arising out of what comes to our minds when we think on diamonds, are called fantasy fancy shapes or fancies.

Based on their shapes, fancies have also had their own names, the best known are round, princess, emerald, asscher, marquise, oval, radiant, heart and pear.


It is logical to think that a bigger the diamond will be more valuable, won’t it? There is one curious thing about the diamonds weigh, and it is the pressure with which it is made.

Diamond weights are indicated in metric carats (ct). One metric carat is two-tenths (0.2) of a gram. Diamonds are weighed to a thousandth (0.001) of a carat and then rounded to the nearest hundredth, or point.

Little differences on carat, can mean price differences of hundreds, even thousands of dollars, depending on the quality of the diamond.

Its price depends on a series of variables; weight is just one of them. It's really a simple concept: big diamonds are rarer than small diamonds.

** Don’t confuse the term carat with karat. Karat is a unit of measure used to describe how much pure gold there is in an alloy.

TO KNOW MORE: https://www.gia.edu/diamond-quality-factor

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