4Cs of Diamonds

4Cs Of Diamond: A Diamond is a precious stone made of pure crystallized carbon that is generally colorless and transparent. Although it is brittle, it is also very hard; the diamond index being 10 on the Mohs scale (scale measuring the hardness of minerals from 1 to 10).

A Diamond is a gemstone made of crystallized pure carbon that is naturally colorless and transparent? Although it is brittle, it is also very hard; the diamond index being 10 on the Mohs scale (a scale measuring the hardness of minerals from 1 to 10).

The value of a diamond is based on internationally recognized criteria, called the 4C rule (4Cs Of Diamonds).

  • Carat (the weight), which corresponds to 0.20 g and is divided into 100.
  • Color, measured by a scale from D to Z.
  • Clarity (purity), determined by acronyms ranging from IF to P3.
  • Cut (the size), which takes into account the shape and the proportions of the diamond, and which goes from EX (excellent) to P (bad).

These four criteria are transcribed on paper in the form of a certificate where the characteristics of the diamond are marked: its weight, its color, its size, its purity. But also its proportions, its finish, its dimensions, its fluorescence, and even its defects. All of these characteristics will influence the value of the diamond.

The certificate, therefore, makes it possible to give a kind of “identity card” to the diamond. By attesting to the authenticity of its description, but it does not indicate its value.

What is the 4Cs of Diamonds?

Each of the 4Cs of Diamond – Cut (Size), Color (Color), Clarity (Purity), and Carat (Weight) – play some role in the beauty of a diamond, although it is complicated to consider each component in isolation. The 4Cs of a diamond interact with each other to form a whole, creating unique alchemy. In general, we recommend giving priority to the quality of the cut, which makes the diamond beautiful and which will allow its brilliance to be maximized.


The Color (ct) is the first criterion of the 4Cs. Diamond is predominantly colorless, yellow, brown, or gray. It can also be other colors (blue, green, black, translucent, white, pink, purple, orange, or red) but it is much rarer.

The color of a diamond is essential in estimating its value. It is measured using a scale from D to Z: A ​​diamond of color D will be colorless, while a diamond of color Z will be pronounces yellow and less brilliant. The color of a diamond is estimated under artificial white light by comparing it to other diamonds.

Diamonds can be divided into two groups: the so-called “Cape” series, which includes most diamonds and whose color varies from colorless to shades in light yellow and special-colored diamonds, also called “fancy” diamonds. Which are naturally colored? More info click here; Diamond Color


The clarity (purity) is the second criterion of the 4Cs. To determine the quality of the purity of a diamond, inclusions (accident, deformation, or solid body in a diamond) are classified by size, color, weight, and nature.

To find out if a diamond contains inclusions and, if there are any, their kinds, it is examined with a microscope and a magnifying glass x10. The number of inclusions influences the estimate of the degree of purity.

The purity of a diamond is determines by acronyms: L for a pure diamond (a diamond is considered “pure” when it is devoid of inclusions on the outside as well as on the inside) up to I3 for a diamond containing inclusions visible to the naked eye (this type of diamond is of no interest to Gemistone Jewelers stores because they have no sparkle).


The weight (carat) is the third criterion of the 4Cs. Like all gems, the unit of measure for the weight of diamonds is the carat. It should not be confused with carat which determines the purity of metals such as gold.

Adopted in 1907, the carat corresponds to 0.20 g and is divided into 100 hundredths. It only measures the weight of the diamond, so it does not determine its size (two diamonds of the same weight can have different dimensions). More info click here; Diamond Weight


The cut (ct) is the fourth criterion of the 4Cs. The size of the diamond refers to the shape and proportions of the stone.

The 4Cs of diamonds certificate transcribes its size by 3 criteria which are rated from poor to excellent:

  • The “cut grade”, that is to say, is the general quality of the cut of the diamond which determines the brilliance. When a diamond is cut in the right proportions, the light harnesses the refraction of the diamond to the fullest. Otherwise, it lets out some of the light.
  • The finish, which determines how the stone has been polished when cut
  • The proportions, that is to say, the appreciation of the measurements and angles of the stone. They are estimated from the table (large flat facet on the top of the diamond – too large or too small a table often indicates poor proportions) and depth (the height of the diamond, measured from the lowest point of the Colette – tip of the breach formed by the meeting of the facets in a single point – and the table). The proportions are expressed as a percentage relative to the diameter of the stone representing 100% of the value.

Cutting helps bring out the purity and color of the diamond and determines its brilliance and how light will reflect on it. It particularly influences three main characteristics of diamonds:

  • The brilliance of a diamond, that is, the light reflected by the diamond. When light hits a diamond, rays of light enter the diamond and some will be reflected.
  • The sparkle of the diamond (sparkle of the diamond when it is tilted).
  • Diamond fire: when the light comes out of the diamond tablet, it is slightly deflected, causing a color spectrum. These colors are the “fire” of the diamond.

The splendor of a diamond, therefore, stands out more when it is diamond cut.


In the Middle Ages, the facets of diamonds were smoothed out as they appeared. Size didn’t matter. It was only at the beginning of the 20th century that certain symmetry began to be observed when cutting diamonds.

The ancient cut of a diamond can be distinguished from the modern cut by the fact that the tip of its breach is cut off, while that of the modern cut diamond is intact.

Studies on these values ​​have focused on the size that would give the maximum refraction to the diamond; the modern size is more particularly attached to shine.

An ideal size?

The ideal size a diamond should be for maximum sparkle is a subject still hotly debated by professionals.

Each diamond is unique must be carefully studied by a diamond dealer to determine the ideal size it should have to achieve optimum brilliance.

Diamonds are not all the ideal size because the raw material of diamonds is expensive, but during cutting, diamonds can lose up to 70% of their material. A diamond dealer must therefore find the right balance between the weight of a diamond and its quality.

On the other hand, since cutting is a very delicate job, the slightest mistake can change an “ideal” cut diamond to a “good cut” diamond.


Fluorescence: When a diamond is exposed to ultraviolet (UV) light, it can emit a luminous effect, usually blue: this is called fluorescence.

Although fluorescence is not directly related to the color of a diamond, its intensity (zero, weak, medium, strong, very strong) must be indicated on the certificate.

Fluorescence is indeed more or less recommended depending on the original color of the diamond. Thus, for diamonds classified in high colors (letter D to F), strong fluorescence is not recommended because it slightly affects the transparency of the diamond.

On the other hand, it is recommended for diamonds of “low” colors (J and lower) because it gives a whiter light to the diamond, preferable to its original yellow or brown hue. If you want to more information about 4Cs of Diamonds visit our online store at www.Gemistone.com

More info click here; https://www.newsniz.com/

By jolly

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