Natural Colour Pink Diamonds

An introduction to what pink diamonds are, and why pink diamonds are great investments or purchases

A pink diamond is one of the most sought after beautiful gemstone in the world, for both its beauty and its rarity. It is therefore unsurprising that a high quality pink diamond is also one of the most expensive and difficult to acquire diamonds in the world.

If you are planning to invest in a pink diamond for your loved one, whether to wear or to have in an investment portfolio but are not sure where to begin, then Argyle Diamond Investments Pty Ltd can offer a range of suitable options. There are a number of aspects to pink diamonds to be considered before any purchase. In this broad guide, we will discuss why a pink diamond’s origin, and its unique nature affects the value based on the pink diamond’s colour. 

Diamond Colours

People are becoming more aware that diamonds exist in a variety of colours beyond the traditional white.  In fact, it is possible to obtain diamonds ranging in colour from blue and green, to brown, pink and yellow. Whatever the colour – the more intense it is, the more expensive the diamond will be. Whilst gemmologists are not usually able to determine exactly how certain coloured diamonds obtained their colours, various studies have been conducted which indicate that the huge pressure undergone during the creation process is at least partially responsible. Some of the scientific mystery on how coloured diamonds are formed is part of their appeal.

Pink Diamonds

Pink diamonds, along with any other hued varieties, are referred to as ‘fancy coloured diamonds’. The larger the size, and the more intense the pink colour, the more valuable the diamond will be.

One of the largest known Fancy Vivid Pink diamonds is the ‘Pink Star’ formerly the Steinmetz Pink was found in a South African mine in 1999. With a clear pink colouring it weighs in at just under 60 carats. It was sold at auction in 2017 for a staggering US$71.2 million. This set the tone for the future of pink diamonds by surpassing the previous record of the 24.78 carat ‘Graff Pink’ graded by the GIA as a Fancy Intense Pink diamond, and sold set in a ring, for US$46 million just three years prior. Point of interest – the Pink Star was valued at around US$22 million at that time. Two older pink diamonds the ‘Daria-i-Noor’ and the ‘Noor-ul-Ain’ are larger, weighing in at 182 and 60 carats each. It is believed these two diamonds were actually one diamond with the Noor-ul-Ain being recorded as property of a 17th century Golconda sovereign from South India. These two can be found, set separately in a brooch and a tiara, within the collection of the Iranian National Jewels from the 16th century.

Pink diamonds can be brownish-pink, purplish-pink, and orangy-pink. Sometimes a pink diamond can exhibit both brown and orange hues at the same time. However, the most sought after pink diamonds are those that are a pure pink, closely followed by those with a purple tint. 

What gives the diamond its pink color?

The precise source of the colouration in these diamonds remains unclear, and various theories exist within the gemmological world which seek to explain exactly what has happened. It is generally accepted that a blue diamond obtains its colour from either boron, or hydrogen that it absorbed, and a green diamond obtains its colour from passing through radioactive earth; but a pink diamond obtains its hue due to a deformation within the structure of the diamond which causes the emission of red light in various degrees of intensity, making most of these diamonds look pink.

The most accepted theory is that some diamonds go through more pressure than others during their formation process, and that pink diamonds represent those that have undergone the highest levels of pressure. It is also believed that seismic shocks may lead to altered molecular structures within the diamond, further contributing to the resulting pink appearance.

It can take millions of years for a pink diamond to form. It travels to the surface through intense heat, and will be subjected to severe compression during the formation process. A process transforming the crystalline structure so that it allows only a pale red light to be emitted from the diamond.

Intensity and Clarity

Pink diamonds vary widely in their intensity – which refers to the effect the combination of tone and saturation has on the appearance of the diamond. The GIA, or Gemological Institute of America, after assigning a colour grade based on the dominant hue, compares a diamond against a master set of coloured stones to categorise the intensity as Faint Pink, Very Light Pink, Light Pink, Fancy Light Pink, Fancy Pink, Fancy Intense Pink, Fancy Vivid Pink, or Fancy Deep Pink. Within this range, Fancy Vivid Pink diamonds have been historically the most expensive, valued at least 20 times more than an equivalent high-quality white diamond with the same clarity and carat weight. The Argyle mine, the world’s biggest source of quality pink diamonds, identifies the intensity of its pink (P) diamonds on a scale of 1 to 9, where 1P exhibits the deepest tone and saturation of pink.

As pink diamonds undergo extremely high pressure for extended periods of time, they usually have an irregular shape. The highest quality specimens have no impurities and are free of any yellow tint. The clarity of a pink diamond is best determined at 10x magnification in a well-lit area. It is said that only 7% of the world’s supply of pink diamonds are ‘flawless’ or ‘internally flawless’. However, even with lower clarity, the pink diamond still sits above most other coloured diamonds and remains of high value.

Why are pink diamonds so rare and expensive?

Pink diamonds are so expensive due to their extremely limited supply. They have been sourced at a small number of locations globally, including Brazil, Russia, South Africa, and Canada. Argyle Mine in Australia holds a record for being the major producer of pink diamonds accounting for a whopping 90% of the global supply. However, even in this mine, pink diamonds are so rare that out of the 800 million carats of diamonds produced, pink diamonds make up less than 1% of the total.

The scarcity of pink diamonds inevitably makes them even more sought after. They have a stunning beauty, and a carefully chosen one can take your gem and jewellery collection to another level. This rarity, and limited availability creates an extremely smart investment option.  Navigate the procurement, sale and safe storage of your investment pink diamond with the specialist diamond consultants of Argyle Diamond Investments Pty Ltd.