What are the 4 C’s?

What knowledge is required when you are interested in purchasing an investment diamond? Above all, knowledge regarding the 4C’s, the parameters used to determine the quality of the diamond, is of paramount importance. This abbreviation stands for carat, color, clarity and cut.

The 4C's determine a diamond's quality and are used to identify gemstones.


The weight and size of a stone is expressed in carat.


Colours range from D, colourless, to Z, the yellowest.


Most diamonds are born with birthmarks, known as inclusions.


Cut refers to a diamond’s proportions, symmetry and polish.



The weight and size of a stone is expressed in carat. 1 carat is 0.2 grams and can be divided into 100 points or 200 milligrams.

The correlation between carat weight and diamond value can be surprising. The higher the carat weight, the more unique and higher priced a diamond will be. This is the reason why a 2 ct diamond has not twice, but triple the value of a 1 ct diamond.

The carat weight of a diamond also has a symbolic meaning. While the difference between a 0.98 ct and a 1.01 ct diamond is hardly visible to the naked eye, the price of the 1.01 ct diamond will be noticeably higher. This price difference can easily be explained. Some weights are considered “magic sizes”, e.g. 1 ct and 1.50 ct, and are therefore more expensive.

BAUNAT recommends diamonds with a carat weight ranging from 1 ct to 5 ct


The colour grade of a white diamond is determined by an internationally recognized colour palette. Colours are graded from D, colourless and the most sought after grade, to Z, the yellowest hue. The value of a diamond is strongly related to its colour.
Diamonds can also possess a more intense colour, such as brown, orange, pink or blue. The most intense colour shades are called 'fancy', which is specified on the certificate. These coloured diamonds are extremely rare and therefore very valuable. They are, however, also more speculative.

Our experts noticed that the resale market for very rare diamonds (coloured, very large, fancy cut) is remarkably smaller. It requires more time to resell these diamonds at a desirable price.Do you nevertheless wish to invest in coloured diamonds? It is possible at BAUNAT DIAMONDS.

BAUNAT recommends D, E, F, G for white diamonds


Most diamonds are born with so-called birthmarks, also known as inclusions. A magnifying glass or microscope (x10 enlargement) is used to determine the clarity of a stone. Flaws that cannot be seen at x10 enlargement are considered to be non-existing. The fewer flaws are present, the higher the value of the diamond will be. This is because these diamonds are much rarer to find. Inclusions can also interfere with the brilliance of a diamond, as they may interfere with the reflection of light within the diamond.

The key thing here is that inclusions should not detract from the beauty of a diamond. That is why BAUNAT DIAMONDS only selects diamonds with inclusions that cannot be seen with the naked eye.

Two types of inclusions:

The clarity of the diamond can be flawed in two ways:

External inclusions that occur during the cutting process or stem from daily wear & tear.
Internal inclusions that are flaws within the stone itself. There are many different types.

Most common inclusions:

Black or dark spots originating from non-converted coal.
Clouds are microscopic veils that have a negative impact on the clarity.
Feathers are the most common impurities in diamonds. They arise from a molecular break during their creation process.

BAUNAT recommends clarities higher than VS2 and up to Flawless


The cut is a diamond´s most important characteristic. It is the factor that determines a diamond´s fire, sparkle and brilliance. Cut refers to a diamond’s proportions, symmetry and polish. If the depth of a diamond is too shallow or too deep, it will allow light to escape through the sides or through the bottom of the stone. A well-cut diamond will reflect almost all the light through the crown, resulting in the diamond’s characteristic brilliance.

BAUNAT only works with Very Good and Excellent cut diamonds

Cut quality

The Round Brilliant is the most sought after cut in the world. It owes its appeal to its superior brilliance. The mathematically engineered shape with 58 facets was conceived to maximize light reflection. Because of its predefined form, it is possible to grade the cut as a whole. Grades range from 'Poor' to 'Excellent'. BAUNAT DIAMONDS only works with 'Very Good' to 'Excellent' cut diamonds.

Fancy cut

The term “cut” can also describe the shape of a diamond. Other shapes than the standard round brilliant are called fancy cuts. The most well-known are the princess, cushion, pear, oval, heart and emerald cut. Do you want to invest in a more unique diamond? Then you can opt for Special Diamonds.

All investments carry risk and all investment decisions of an individual remain the responsibility of that individual.

Our diamonds

With the largest selection of certified diamonds in the world, we offer the 10 classic diamond shapes, starting from 1.00 ct or higher. All our high quality diamonds are ethically sourced and certified by a leading international diamond grading organization, such as GIA, IGI and HRD.

Start to invest See our selection of loose diamonds