The 4 C'S

The value of a diamond is based on several characteristics that are commonly known as the "4 Cs". There's the carat weight, color, clarity, and cut. All 4 of these elements help determine the value of a stone. The costlier ones will be diamonds that are graded closer to the left of one, if not all, of these scales. Despite the value many place on clarity, both color and cut are just as important on the visual appearance of a diamond.


Every diamond is ultimately unique as there are no exact replicas. This may lead one to wonder what helps professionals determine the fair price of your diamond. Ultimately, the rarer a diamond is in any particular category of the 4Cs, the higher its price will end up being.

A better comprehension of the Four Cs, will give you a better understanding of the World Gemological Report with regards to the stone in which you may be interested in purchasing. This knowledge will help you make an informed decision when it comes time to buying that special diamond.


The weight of a diamond helps indicate its size, and the carats weight helps evaluate this weight. One carat equals 1/5 of a gram.
That means that if a diamond weighs less than one carat, than its weight will be indicated in points (1/100 of a carat). As such, a half-carat stone weighs 50 points. If a diamond weighs over one carat, its weight will be viewed in terms of carats and decimals. This means that a 1.25 carat stone weighs one carat and 25 points.


A diamond's color is marked in reference to how noticeable its tints are as most diamonds have tinges of yellow or brown. The value will drop as the color is more noticeable while the less noticeable the color will make the diamond rarer, and will add to its value.

There is an exception to this rule: If your diamond has tints of a color other than yellow or brown - for example, if it is blue, purple or red - it is considered to be "fancy-colored," and is graded differently.

However, there's an exception to this rule. This exception depends on whether your diamond has tints of a color other than yellow or brown. For example, if it is red, blue, or purple, than it is considered to be "fancy-colored," and will be graded differently.

For diamonds in the yellow/brown color range, gemologists will grade them based on a finely calibrated scale which can compare it to a master set.


During the formation of a diamond tiny crystals may get trapped inside it, or the stone may develop irregularities on its surface. That means that a diamond's rarity depends on its clarity, and how difficult it is to spot these flaws, which in turn helps rank its clarity.

The two kinds of flaws gemologists will look for are blemishes, which are scratches found on the stone's surface, as well as for inclusions, which are flaws found inside the diamond. The value of a diamond will go up, depending on the amount of magnification needed to see the clarity characteristics.
It's important to point out that truly flawless diamonds are very rare, and many gemologists have never encountered one throughout their career.


The sparkle of a diamond is a big part of its allure. The sparkle depends on how a stone is cut - its symmetry, durability, polish, and proportion of its parts – which help determine how light travels through the stone and than back to the human eye. In an ideal situation, once the light hits the top of a diamond, it will then travel through the stone and then out the top again, which will create the desired sparkle effect.

This sparkle will depend on the proportions between the following factors: A diamond's table size, crown angle, and pavilion depth. There are many combinations that can achieve the same level of sparkle, but what's most important is how these factors work in unison on your particular stone in order to create the maximum brightness effect.

Gemologists study three light effects in a diamond to determine the quality of its cut:

GIS Carat Weights