Color diamonds: Finer, Rarer, More Valuable, More Expensive

When you think about it, this coveted diamond is just a mineral made of carbon. And yet, for thousands of years the diamond has been used to make exceptional jewelry of great value. 

Its rarity makes this stone much more precious than any other stone. Its value is multiplied when it presents a color. Indeed, know that we can find blue diamonds, red, green or yellow. 

These are even rarer than colorless diamonds, which explains its extremely high value. We would count a colored diamond out of 10,000 diamonds. So where can we find some? 

Where do their colors come from? How much is their value? Discover in this article everything you need to know about these exceptional stones.

The specificities of colored diamonds

For a diamond to take on a particular color, chemical elements such as aluminum or iron, for example, must be present. It is also necessary to take into account the conditions of temperature and pressure. 

Thus, while pink diamonds can be found in the Argyle mine in Australia, in Lesotho the green and blue diamonds stand out from the colorless diamonds.

Colors that are expensive

It is known that the more intense a diamond is, the higher the value of the diamond. This is why when a diamond dealer talks about a colored diamond, it always refers to its intensity. 

Each gem is then referred to as “fancy light”, “fancy”, “fancy intense” or “fancy vivid” depending on the intensity of the color. For example, if your jeweler says “fancy light green”, it is a low intensity green diamond. A fancy intense red diamond is a bright red diamond.

Estimate the value of a diamond according to its weight

In addition to its color, the value of a colored diamond also varies according to its weight. Its unit of measure is the carat which is not to be confused with the carat of gold used to define the purity of this yellow metal. 

The carat of a colored diamond equals 0.20 grams. In other words, 1 gram of colored diamond equals 5 carats. Naturally, the heavier the stone, the higher its value. The density of the diamond is also a criterion to take into account to estimate its value. 

First, because the denser a diamond is, the more it will be heavy and therefore more expensive. For example, if a sapphire has a density ranging from 3.95 to 4.03, the colored diamond has a density ranging from 3.50 to 3.53. This means that even at equal weight, a colored diamond will be visually larger than a sapphire.

Where do the diamonds come from?

Several factors come into play to provide colored diamonds with their colors that make them so special.

The colors of the rainbow

It is known that a white diamond is colorless because it is composed solely of carbon. This means that he can not absorb any color and that is why he thinks them all without exception. 

Unlike white diamonds, colored diamonds absorb all the colors of the rainbow and reflect only one. Thus, by absorbing all the colors, a blue diamond for example only reflects the blue color.

The impurities

If most of the time, the impurities are considered devaluing, for a diamond, these are useful to provide its color and thus increase its value. Indeed, some gases and non-existent chemical components in a colorless diamond can influence the color of colored diamonds. For example, boron is responsible for the blue color and nitrogen provides the yellow color for a diamond.

Natural irradiation

The color of diamonds is determined during their formation and crystallization. The presence of radioactive elements during diamond formation shows that other different carbon particles have interacted with the diamond to give it a particular hue. Moreover, the hydrogen atoms present in the stone during its crystallization can themselves be tinted and thus also bring nuances to the diamond.


Basically the graining process is explained by the tensions present during crystallization of the diamond to provide a hue ranging from pink to brown. 

The tinted appearance of the rough stone is very favored by the diamond cutters for the reason that it accentuates the brilliance and naturally the value of the diamond. Most colored diamonds have a secondary hue making these diamonds more valuable and more expensive.


What does each color contain?

For the choice of your diamond, here is a list of the rarest colors and the sought after as well as their strengths. Indeed, a diamond is not just a stone. Besides its value, it can mean a lot to the wearer and you must know that every color expresses an emotion.

Pink diamonds

Often associated with romanticism, pink is also the most feminine color. Diamonds bearing this color are extremely rare and therefore very expensive. They are found mainly in the Argyle mine in Australia.

Red diamonds

Red diamonds are actually very intense pink diamonds. Of extreme rarity, the only ones that have been extracted so far are small. The largest stone called the “Moussaieff Red Shield” weighs only 5.11 carats.

Blue diamonds

Known to be mysterious stones, blue diamonds are extremely rare. The colors of these diamonds vary from sky blue to deep blue ocean. Most of these stones come from South Africa in Cullinan and the Golconda region in India.

Green diamonds

If you are looking for the rarest, green diamonds will satisfy you. Indeed, given their rarity, they are the most sought after colored diamonds. They are usually found in South Africa, but some parts of Africa also have some.

Yellow diamonds

Of all the precious stones, yellow diamonds are the most likely to capture the sun’s rays allowing them to shine more than any stone. The most beautiful stones of this kind come from South Africa.

Purple diamonds

All that is known about this violet coloring of this type of diamond is the effect of hydrogen, but the process is still unexplained. These diamonds are often small and it is rare to find more than one carat.

How much is the value of color diamonds?

While a colorless diamond is already worth much more than gold ($ 40,000 per kilo of gold while the carat of a white diamond is $ 20,000 or $ 100,000 per gram and therefore 100 million dollars per kilo), the price per carat of a colored diamond is estimated at 50 times. 

To speak of colored diamond in kilo amounts to speaking in billion. The most expensive diamond in history, named the Pink Star, has been sold for an exorbitant $ 83 million. 

This is a pink diamond of 59.60 carats. Although it is the most expensive diamond, apparently the blue diamond still has the coast alongside lovers of colored diamonds.


The blue diamond more popular than the rose

The Zoe Diamond, this is the name given by its buyer to this beautiful diamond WS2 bright blue pear-shaped 9.75 carats. Estimated at an auction between $ 10 and $ 15 million, the lucky winner (an anonymous buyer from Hong Kong) was able to acquire it for $ 32.65 million. 

If we do the math, the carat is $ 3.3 million and the kilo is $ 16.5 billion, 400,000 times more expensive than gold. This stone of exceptional rarity and beauty without equal is also almost indestructible. 

Six days earlier, a 2.09-carat heart-shaped red stone has changed hands at a cost of $ 5.07 million, or 2.43 million carats. One of the most expensive diamonds sold so far is, of course, also a Fancy Color copy. 

It is a deep pink rectangular stone weighing 24.78 carats from the collections of the New York diamond dealer Harry Winston. This diamond was sold for $ 46 million, or $ 1.86 million per carat. In addition, the blue diamond wins on the pink diamond if we rely on these data.

Guide to buying your diamond

Buying a diamond is a huge investment. Therefore, as with the purchase of a house or a car, it is important to make a meticulous study before launching. For you to be informed, discover the elements to absolutely know.

The 4C: what is it exactly?

As part of the diamond jargon, the 4Cs define the characteristics of a diamond as much on its value as on its beauty. So the 4Cs are:

  • The carat which is the unit of measurement of the weight of a diamond
  • The size (Cut)
  • Color (color): the natural color of the diamond that can affect its value
  • Purity (Clarity): determination of impurities or inclusions in the stone.

Be aware however that although a diamond is large is weighing more in carats, it can be cheaper than a smaller one whose purity and color are much better. It is then essential to take into account all 4C.

Consider the brilliance of the diamond

Everyone has their perception of beauty and it is simply the personal taste of each. Some are conquered by shape or size, others by color. Indeed, these are factors that should not be overlooked, however, the most important aspect of the beauty of a diamond lies in its brilliance. 

Also called fire or shine, the brilliance of the diamond is the element that gives life to the diamond. The art of pruning and polishing is the only way to optimize the brilliance of a diamond. 

Indeed, each facet must be placed in perfect symmetry and polished with care and precision. A diamond cut according to the rules of art will be able to refract the light from one facet to another, disperse it or restore it from the top of the diamond. 

This effect called back lighting is measurable through optical technologies. On the other hand, if the diamond has not been cut and polished properly, it will reflect on its brilliance. 

For example, a stone cut too deeply will let light escape through the opposite side of the diamond. And if the size lacks depth, it will let the light escape through the bottom of the diamond. Thus, the return of light is a criterion not to be neglected. 

It contributes immensely to the beauty and value of your diamond. It would be a shame to spend a fortune on a stone that has trouble getting noticed. the return of light is a criterion not to be neglected. 

It contributes immensely to the beauty and value of your diamond. It would be a shame to spend a fortune on a stone that has trouble getting noticed. the return of light is a criterion not to be neglected. 

It contributes immensely to the beauty and value of your diamond. It would be a shame to spend a fortune on a stone that has trouble getting noticed.


The certificate

To be sure of the characteristics of a diamond, namely the 4C, require a certificate. It is a written proof of the qualities of the diamond used as a basis for determining its value. 

In addition, without the certificate, nothing can assure the quality of the diamond you buy. In addition to providing you with the information you need to assess the fair value of your diamond, the certificate can also serve as a point of comparison for several diamonds. 

This certificate is issued by independent gemological laboratories. Among the gemological laboratories existing in the world, you have: the laboratory of the Paris Chamber of Commerce and Industry or CCIP, the European Gemological Laboratories or EGL, the International Gemological Institute or IGI, the Gemological Institute of America or GIA.

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