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Desired Fancy Colours

Coloured diamonds are something special. Not only because of their rarity but also because of the incredible variety of colours and hues. Here we present the most sought-after colours in a little more detail.

Yellow Diamonds

Formation and intensity

The yellow colouring results from the additional incorporation of nitrogen atoms into the crystal lattice of the diamond. Nitrogen absorbs the violet and blue part of the light spectrum and therefore makes the stone shine in the complementary colour yellow. Depending on the amount of nitrogen incorporated, the intensity of the yellow varies.

Yellow diamonds with a particularly intense colour are called "canaries" or "canary yellow". Such intense colours (like "intense" or "vivid") are extremely rare and therefore very valuable.

Overtones

The most common overtones in yellow diamonds are green and orange. Brown, on the other hand, occurs rather rarely. Pure stones without overtones are preferred, but it is precisely the overtones that lead to mixtures of extraordinary individuality.

Occurrence

Today, yellow diamonds are found in a wide variety of mines. Frequently, "Cape diamonds" are from the corresponding province of South Africa. However, "Cape" is no longer used exclusively for the geographical origin, but also as a synonym for the special, yellow colour.

Prices

For a yellow diamond of reasonable clarity and colour, a price of 3'000 to 5'000 US$ per carat can be expected. For a stone of intense yellow colour, the price may well rise to 8'000 to 16'000 US$.

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Orange diamonds

Formation and intensity

Naturally formed diamonds in orange also owe their colour to the inclusion of nitrogen atoms in the crystal structure. A pure orange is probably the rarest variation in coloured diamonds. For a long time, red and green were classified as rarities. With the discovery of red diamonds in the Argyle Mine in Australia, this became obsolete. Since then, "pure orange", i.e. without any brown shimmer, has been the most sought-after colour among enthusiasts and collectors - including waiting lists. Although demand is not as high as for other colours, this in no way diminishes their popularity.

Overtones

Pure orange is simply the mixture of the primary colours red and yellow. However, it is not so simple with diamonds. Mostly, orange diamonds present themselves in nuances between yellow-orange and orange-red. The most common overtones are yellow and brown. Pure orange is very rarely recognised by gemological institutes and is thus almost as rare as red fancy diamonds.

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Green diamonds

Formation and intensity

The exact reason for the formation of green diamonds has not yet been proven. It is assumed that one of the causes is radioactive radiation that affects the diamond over a longer period of time. Thus, the diamond eventually absorbs parts of the magenta-coloured light spectrum and therefore glows green. The tone can range from "faint green" with a slight green shimmer to "fancy deep" with a deep green colour.

Compared to other fancy coloured diamonds, it is extremely difficult to determine whether the colour has been artificially treated to intensify it. Therefore, green diamonds are always examined in detail by gemological institutes before certification.

Overtones

Apart from the intensity, the overtones that occur also have a very decisive influence on the colour effect. Pure green stones are the rarest and consequently the most valuable. Due to the great variance of overtones, every green diamond is truly unique. The most common overtones are yellow, blue, brown and grey.

Prices

A fancy green diamond can easily be priced at 50'000 to 100'000 US$ per carat. For an intensity in the fancy-intensive range, one has to reckon with 150'000 to 200'000 US$ and for a fancy-vivid one with at least 300'000 US$, each per carat.

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Pink diamonds

Formation and intensity

The origin of the pink colour in diamonds is still a mystery today. Research currently assumes that the stones are exposed to disturbances during the formation process that create irregularities in the growth (so-called "grain lines"). These "grainings" create a grain, which changes the refraction of light in such a way that the diamond appears pink. The more graining a diamond has, the more intense the pink colour. Pink stones with high clarity grades are therefore very unusual and rare. Pink stones come in a wide range of intensities, but the more intense the colour, the more valuable the stone. Pink diamonds are among the rarer fancy coloured diamonds and are extremely popular. The high demand and low availability make them valuable on the one hand and interesting for investors on the other, as their price has been rising continuously for years.

Overtones

Pink diamonds without an overtone are usually more valuable than stones with secondary colours. Exceptions are, for example, a purple overtone, which has a value-increasing effect. The overtones make pink diamonds shine from delicate old rose to rich pink tones. The most common overtones are purple, brown, grey and orange.

Occurrence

Pink diamonds are mainly found in small mines in Africa, India and Brazil. However, as with many fancy colour diamonds, the main place of discovery is the now closed Argyle Mine in Australia. The pink stones found here are often more intensely coloured. The pink from this mine is so unique that diamond dealers worldwide can recognise their origin by their colour. These diamonds are particularly popular as investment stones. Especially when they are accompanied by an original certificate from the Argyle mine. As a rule, the best prices can be achieved this way.

Prices

Due to their great rarity and wide quality span, pink diamonds cost between 10'000 and 700'000 US$ per carat. For very special pieces, however, more than 1'000'000 US$ per carat have been paid.

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Blue diamonds

Formation and intensity

Basically, the blue colour is triggered by additional atoms of the semimetal boron. The more boron is incorporated, the darker the blue colour appears. Sometimes the colour is influenced by additional nitrogen molecules. Blue diamonds are very rare; especially stones with rich blue tones fetch the highest prices.

Overtones

Without overtones, blue diamonds are a real rarity. Most blue diamonds have a grey overtone, often also a green one. The most valuable natural stones are those without an overtone or an overtone that accentuates the blue base colour.

Occurrence

In the past, most natural blue diamonds came from the Indian subcontinent. In the meantime, however, South Africa has become the largest producer of blue diamonds. Besides the South African Pretoria Mine, the Australian Argyle Mine is also known for magnificent blue colours.

Prices

For an average blue diamond with a medium hue, you have to reckon with around 200'000 US$ for one carat. However, the price range for particularly beautiful specimens is open upwards. Here, up to almost 4'000'000 US$ per carat have been paid.

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Red Diamonds

Formation and intensity

Similar to pink diamonds, the colour appearance of red diamonds is also triggered by the incorporation of, among other things, foreign metallic elements. They are among the rarest diamonds in the world. However, due to the extremely low occurrence, the exact reason is little researched. There is only the assumption that deformations in the crystal lattice could be responsible for this. Pure red diamonds, without an overtone, are generally rare and do not actually exist on the market as larger stones. Their rarity makes them one of the most sought-after, but also most expensive investment diamonds. The increased demand and the closure of the Argyle Mine, the most important producer, have caused prices to rise steadily.

Overtones

The overtones create diamonds in a wide range of red tones. The overtones range from brown to purple to orange. In contrast to all other coloured diamonds, red diamonds are exclusively classified in the intensity "Fancy Red".

Occurrence

Since red diamonds were discovered in the Argyle mine in Australia, most of them came from here. But finds have also been reported from South Africa and Brazil.

Prices

Due to their rarity and their exceptionally intense carmine colour, red diamonds command the highest prices. On average, they cost over  1'000'000 US$ per carat. However, prices of up to 1'600'000 US$ have also been paid.

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