Diamonds in fancy colours

Coloured diamonds are gaining recognition in the jewellery industry and the interest of investors around the world. The demand for these unique gemstones is increasing. With a very low annual supply, their prices strongly increase. Besides, coloured diamonds are very rare. It is worth acquiring some basic information about them, as they can be an interesting proposition in an investment portfolio or a jewellery collection.

The value of a coloured diamond is indicated by its hue

Therefore, the most important parameter for the valuation of coloured diamonds is their colour. GIA, the Gemmological Institute of America, recognizes 27 different colours for fancy colour diamonds, as shown in the graphic below.

Diagram of Hue Intensity for Blue

Source: GIA

Most often, a diamond whose colour contains a single dominant hue is regarded as more valuable than its shade, e.g. a diamond in Yellow will be worth more than a diamond in Brownish Yellow, because single colour diamonds are less common. There are, however, exceptions to this rule. There are rare colour combinations that are more valuable than single colours, e.g. fancy yellow diamond with addition of orange, i.e. Orange Yellow.

Red, blue and pink diamonds are of the highest value. The latter (pink) are extremely unique - because due to the closure of the Argyle mine, which extracts 90% of these extremely rare diamonds, they will soon cease to be available on the primary market. Purchasing diamond jewellery containing this amazing natural wonder can therefore turn out to be an excellent investment.

Diamonds, as shown in the graphic above, come in the following colors: Yellow, Green, Blue, Purple, Red and Orange. There are also diamonds in other colors, such as Black, Gray, Pink and Brown. The stones are one colour or contain an admixture of the other. One colour is dominant and appears as the last member in the diamond's name.

Example

Yellow Orange – the colors appear in almost identical proportions with the predominance of orange.

In addition, if the name of the first colour is a diminutive of the base color, e.g. Greenish, it means that the proportion of that first color in the final color of the diamond is negligible.

Example

Greenish Yellow – the dominant color is yellow, while green is only an admixture of the dominant hue. It is assumed that the proportion of the primary color is a minimum of about 75% of the final colour, and that impurities constitute a maximum of about 25%.

There are even more complicated diamond names with up to 3 colours.

Example

Brownish Orangy Yellow – This diamond is the least brown and the most yellow. It can be assumed that the colour with the suffix -ish is up to 25%, with the suffix -y up to 50%; and the dominant colour, without any diminution, up to nearly 100%.

The causes of colour occurance in fancy diamonds

Source: https://geology.com/diamond/colored-diamonds/

Are coloured diamonds unique?

Colourless diamonds account for most of the mining. Coming across a colored diamond is very rare. There is an opinion among mining companies that for every 1,000 carats of colorless diamonds there is 1 carat of coloured diamonds (0.1% of total extraction). Some, like Alrosa, the Russian mining giant, estimate that 1 carat of coloured diamonds per 10,000 carats of colourless diamonds (0.01% of total extraction) is excavated. This explains why the prices of coloured diamonds are much higher than those of colourless stones.

Yellow diamonds are the most popular. It is estimated that they account for 76% of the extraction of all coloured diamonds. Less common are pink and blue diamonds, which account for 5% and 0.5% of the extraction of coloured stones, respectively. Their price will be correspondingly higher than that of yellow stones. Due to the closure of the Argyle mine in Australia, where 90% of the supply of pink diamonds came from, the severely limited availability of new stones will be an additional factor that will affect their higher price.

The Fancy Color Research Foundation estimates that only 3% of diamonds that end up in certification laboratories are coloured diamonds. They are extremely rare. A stone with unique characteristics will be more in demand. More interest will translate into a higher price. The coloured stones are unique. Unlike colourless ones, it is very difficult (even impossible) to find two identical diamonds. This additionally elevates their value.

Table. Main places of extraction of coloured diamonds

Source: https://www.naturallycolored.com/diamond-education/where-do-colored-diamonds-come-from * the mine was closed in 2020.

Unique diamonds in fancy colours

Colored diamonds are extremely rare. Their prices are several times higher than those of colourless stones, which are quite common, but equally beautiful. Yellow diamonds are the most common. The rarest are those in red, pink and blue. There is a strong trend for pink diamonds, especially those mined in the now closed Argyle mine, which, given a very modest supply, strongly pushes their prices up.

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Fancy Colour Diamonds

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