Features of coloured diamonds

To a certain extent, coloured diamonds are very different from colourless stones. Leaving aside the other parameters of the 4C method for a moment, the most valuable are colourless diamonds without colour, in the D-F range. However, the situation of diamonds in fancy colours is completely different. The colour is desirable, and the more intense it is, the more precious the diamonds are. The complexity of the parameters that can characterize diamonds in fancy colours requires a separate study.

The most important features of coloured diamonds

Thanks to the research of the American gemmological institute GIA (Gemmological Institute of America), a uniform, international standard for the evaluation of coloured diamonds has been created. It includes the following features of coloured diamonds that determine their valuation:

Colour Grade (colour class)

It is the most important parameter describing a coloured diamond. It is a combination of colour, its saturation and tone. 

• Hue is the most important parameter in terms of the valuation of coloured diamonds. In practice, "colour" is the term used to describe the actual colours of the spectrum of the reflected light, e.g. red, pink, orange, yellow, green, blue, purple.

Note: If a coloured diamond contains a single hue, it is usually more valuable.
Red, blue and pink diamonds are of the highest value.

• Saturation describes the colour intensity of a given diamond. The higher the colour saturation, the more precious the diamond.

• Tone tells how light or dark the shade of a given diamond is. In practice, the tone depends on the amount of brown, black (e.g. dark green) or gray, white (e.g. light blue) in a given diamond's colour. Diamonds with a darker colour tone are more valued. 

Colour intensity

This is the second most important parameter in terms of valuation. It tells us the relationship of saturation and tone of colour. Diamonds characterized by Vivid intensity are the most desirable.

The colour intensity of coloured diamonds according to the classification developed by the American Gemmological Institute GIA covers 9 levels: 

1. FAINT – faint saturation

2. VERY LIGHT – very light saturation

3. LIGHT – light saturation

4. FANCY LIGHT – fancy light saturation

5. FANCY – fancy saturation

6. FANCY INTENSE – fancy intense saturation

7. FANCY VIVID – fancy vivid saturation. Most desirable.

8. FANCY DEEP – fancy deep saturation

9. FANCY DARK – fancy dark saturation

Diagram of Hue Intensity for Blue

diagram of hue intensity for blue

Source: https://gia.edu

Colour intensity on the example of a Blue diamond

colour intensity for a blue diamond

Source: https://www.gia.edu/fancy-color-diamond-quality-factor

Other features of coloured diamonds

The color and the intensity of colour are two most important parameters describing coloured diamonds. The price of the stone mainly depends on them. The most expensive stones are red, blue and pink with vivid intensity. Of course, you cannot forget about the other parameters, which can also significantly affect the price. When evaluating a diamond, all its features should be considered.

  • Mass (Weight) is the third most important parameter describing a coloured diamond. Similarly to colourless diamonds - the greater the weight, the rarer and more valuable the diamond.
  • Colour distribution is a parameter that describes how uniformly the color is distributed throughout the volume of a given diamond. Diamonds with even distribution are more valued.
  • Clarity is a parameter analogous to the assessment as for colourless diamonds.
  • Cut quality is a parameter analogous to the assessment as for colourless diamonds.
  • The shape of coloured diamonds is less important than that of colourless diamonds. In the case of these rare gemstones - cutters select the best shape in order to obtain the greatest possible mass of a cut diamond.

The rarest gemstones

Coloured diamonds are unique. There is a reason why jewelers and investors are willing to pay a fortune for them. The prices of fancy diamonds are very individual and depend on the specific characteristics of the stone. Knowing these parameters, consumers and investors can make informed purchasing decisions easier and are able to choose the right diamonds for themselves. 

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Fancy Colour Diamonds

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