About Pink Diamonds & Bruce Robinson

The subject of an Argyle pink diamond as an investment is extremely complex. Argyle Diamond Investments (ADI) will consider the salient points involved with investing in
pink diamonds, starting with investment facts and following with the elementary concepts of a pink diamond and supply chain.

This fundamental knowledge will assist investors evaluating potential high return investments.

Argyle certified means cut and certified by the Argyle mine; non-Argyle is simply ‘not from the Argyle mine’, and Argyle-origin is a cut from Argyle mine seconds or roughs.

The term ‘investment quality pink diamond’ is often used loosely by brokers and jewelers with subjective intentions yet it is a well established fact that 95% of Australian sourced pink diamonds are not good investments. That being so, it is essential to deal with a company that specialises in pink Argyle diamonds and can provide current statistics on the financial growth and rarity of the pink diamonds you are considering. As with any investment, the profit is always made with the original diamond selection and purchase price.

From the moment a rough Argyle Pink Diamond is unearthed until the time it is offered for purchase as a polished stone, the definitive collectable is upheld by professional vigilance and dedicated care. The distribution of Argyle Pink Diamonds that are not sold through the annual tender is rightfully managed until it reaches its final owner. These diamonds are sold as loose polished diamonds throughout the year.

A group of master diamond merchants known as Argyle Pink Diamond Select Ateliers and Authorised Partners have been appointed to ensure all market initiatives are in support of the standards of care and chain of custody that are set from the mine discovery to the acquisition of finished fine jewellery or polished diamonds.

Invitation into this exclusive network and the selection of Argyle Pink Diamonds Select Atelier jewellers and trade partners is a vigorous consideration process.

Being a Select Atelier indicates that a jewellery brand has a direct relationship with Argyle Pink Diamonds and is amongst the finest at their craft.

Identifying Pink Diamonds

All pink diamonds fall into two DNA categories:

Type Ia pink diamonds are  predominantly from Australia. They were first discovered in the mid 1980’s in the Kimberly region of Western Australia. They are known to be the rarest and most valuable of all the pink diamonds because of their unique attributes. Type Ia pink diamonds tend to be smaller in size with lower clarity but stronger in colour saturation and intensity. They also display the more popular cooler overtones in colour. Type Ia pink diamonds
generally do not exhibit any loss of pink colour saturation in daylight or vary in degrees of transparency.

Type IIa pink diamonds are predominantly from Africa, Brazil, Russia, Canada and India. They were first identified when scientists found a link between
diamonds sourced from the legendary Golconda mine in India, which are noted for the absence of nitrogen. This made them appear whiter and cleaner than a standard colourless diamond. Type IIa pink diamonds tend to be larger in size with better clarity but have weaker colour saturation. They also display the less popular warmer colour overtones and are more likely to appear with an overall haze and varying degrees of transparency. In most cases Type IIa pink diamonds exhibit a phenomenon that causes a loss of the pink colour saturation in natural daylight, giving them a weaker colour appearance.

The three attributes which determine the colour grade of a pink diamond are: 

HUE The dominant colour of the diamond. Sometimes there are modifying colours or tints that affect hue. For example, a diamond with a pink hue may have a purplish tint. 

SATURATION The strength of pink colour in the hue. Hue saturation in pink diamonds can range from light pink to intense, and at the strongest saturation – vivid.           

TONE The amount of lightness or darkness in the diamond. The range of tone extends from light to dark.



Diamond Colour Grading

The Argyle certified pink colour grading system (below) is the most accurate way of determining a
pink diamond’s true colour and value.

Argyle certified pink colour grading system

The Argyle brand uses a similar viewing box and grade in the same face-up position as the GIA. However, unlike the GIA, the Argyle brand perfectly matches their diamond’s colour strength or saturation to an exact colour reference diamond.


Clarity refers to the size, placement and visibility of inclusions inside a diamond but when it comes to a pink diamond, clarity has less impact on price than it does with colourless or white diamonds. This is partially because it is the rare pink colour you are purchasing. Generally, the inclusions are often much harder to see in a pink diamond due to its colour saturation.

Clarity can still make a significant price difference. A general rule with an Argyle certified pink diamond is that one colour grade is equal to four clarity grades in price. Also, the larger the pink diamond and the stronger the pink saturation gets, the weaker the clarity grade.

Acquiring an Argyle Fancy pink or stronger colour in VVS or VS clarity grades will command a premium price. In non-Argyle pink diamonds it is more common to find VVS and VS as these diamonds are predominantly Type IIa and nitrogen free but they have weaker colour saturations and are more likely to appear with an overall negative haze according to the GIA.

Diamond Cuts

Diamonds come in many different cuts. Most fancy coloured diamonds fall in either of these categories. 

Round Brilliant 

Round Brilliant pink diamonds, just like in the white diamond world, will always sell for a premium over traditional or modified fancy shapes. This is because of their additional cutting wastage and popularity. 

Traditional Fancy 

The Traditional Fancy shapes such as Cushion, Radiant, Pear, Princess, Oval, Emerald, Asscher, Heart and Marquise cut diamonds are the most common shapes and offer a wider selection of sizes, colours and clarity choices compared to round diamonds. They will always sell at a reduced price over an equivalent round brilliant diamond due to their lower cutting wastage. Investing in the more popular fancy shapes will ensure greater demand in the secondary resale market.

Diamond Cuts

90% of the world’s production of pink diamonds are derived from the Argyle mine in Western Australia. The other 10% are predominantly from Africa, India and Brazil, with a small amount of purplish pink deriving from Canada and Russia. When it comes to pricing, a pink diamond’s origin makes a substantial difference to an investor. For example, a GIA Fancy Intense pink diamond from the Australian Argyle diamond mine can fetch a large premium over a Fancy Intense pink diamond with the same colour and clarity from another location. (Christies – Southerly’s)

Pink diamonds from Australia are predominantly Type Ia with a very specific DNA. Other pink diamonds from other countries are generally Type IIa and are perceived to have an inferior DNA.

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