About Diamonds

Learn More About Diamonds From Us

In this page we educate our clients more about diamonds, enabling them to make an informed decision when purchasing their diamond.

Irresistible Diamonds Natural Fancy Yellow

About Diamonds

The colourless beauty and inner fire of the diamond has made this precious gem prized for centuries. Each stone’s complex characteristics cannot be duplicated, and no two diamonds can ever be the same. 

Diamonds are formed deep within the Earth between 90-120 miles beneath its surface, in a section that makes up the interior portion of continents called Cratons. Cratons are the oldest sections of landmasses, this is where the carbon is formed into a diamond under immense pressures and tempertures.

Kimberlite is a special volcanic rock where the richest diamond deposits are found. It is pushed to the Earth’s surface over millions of years from the Craton section, bringing with it – diamonds. 

Kimberlite does not always contain diamond deposits, and even if it does, an estimation of the potential diamond production is meausured to judge whether it is economically viable to be mined. With such factors, the consideration that diamonds are rare is evident.

The rarity is further evident in the percentage of polished diamonds that enter into the world market. Only around 30% of world rough diamond production is “Gem-Quality” (suitable to be manufactured). Furthermore roughly only 12% – 15% is manufactured and set into jewellery, the rest being lost in the manufacturing process.

Diamonds are nearly 100% carbon. What differentiates diamonds from other carbon forms is the way their carbon atoms develop. The diamond atom structure is arranged in a tight three-dimensional pattern.

The differentiating factor lies in the way the layers have been bonded more strongly together in a cubic crystal. This occurs under the pressure and temperature conditions when the mineral is forming. This atom structure is
the reason why diamonds have earned their reputation as the world’s most durable mineral.

The 5 C’s

A diamond’s 5 C’s represent the five main components of its beauty, structure and source: Cut, Color, Clarity, Carat and Country Of Origin. When looking at a diamond, the eye perceives a balance of its characteristics and components, including, but not limited to, the 5 C’s.

Each of the first 4 C’s are graded on a scale to evaluate the diamond’s quality.
Though some universal terminology and standard grading exists,  grading can vary from lab to lab. The 5 C’s aids the consumer in making a more educated decision when purchasing their perfect stone.

Irresistible Diamonds uses only the most credible laboratory certificates recognised internationally – GIA and EGL South Africa.


A diamond’s proportions are the angles of the crown (top half) and pavillion (bottom half), with corresponding sizes, position and alignment of its facets. The consistency and balance of these can greatly affect how the stone captures light and reflects it back to
the eye. The cut gives a diamond the “life” or “brilliance” they are loved for.

As seen in the chart, the cut grade affects how light filters through the stone from the crown, and is reflected back from the angle of the pavilion. As the proportion of the stones worsen, so does the optimal light reflection.

Cut grade indicates how well or poorly a stone has been manufactured. A consumer ultimately wants to purchase a stone with a Very Good to Excellent cut grade.


A diamond’s clarity is measured by the existence or absence of visible flaws. Tiny surface blemishes or internal inclusions, even those seen only under magnification affect the diamonds clarity grading.

Diamonds are graded on a scale as seen in the chart, ranging from Flawless to Heavily Included. Each clarity grading as an affect on the value of the diamond, just as each colour grading does.

Stones are determined to be acceptable for consumers based on the diamond professionals ability to judge if the stone is “eye-clean” or not. This means that even stones which are slightly included are capable of being unnoticable to the human eye.


One factor that determines the value of a diamond is its color. With the exception of fancy-colored diamonds, the most valuable diamonds are those that are colourless.

Diamond colours are graded on a scale from D to Z. The colour is determined by a manual process of comparing the diamond to a master set.

With each change in colour, the value of the diamond is affected. Interestingly enough, diamonds often have a secondary hue of colour that accompanies their dominant colour. The colour D is the only colour to be purely colourless. 

Carat Weight

Carat refers to the diamond’s weight, and ultimately the overall size of the diamond. Carat weight is important to comprehend when looking for the perfect diamond because it has a large impact on your search. 

Because they are rarer, larger diamonds have greater value per carat. Therefore, the price of a diamond rises exponentially in regards to its size. When searching for a diamond for a consumer there are various possibilities that could be given for the same value. 

A diamond of smaller carats but higher quality may be the same prices as a larger diamond of lower quality, so it is important for the consumer to ask themselves what their personal preference is. 

Preferences to consider would be whether they have a budget in mind that they need to aim for, and if so, would they prefer size over quality, or quality over size. If they do not have specific budget preferences – what size and quality of diamond do they feel is suitable for them.

Country of Origin

The 5th C refers to the Diamond’s orgin. Origin refers to the location where the diamond has been geographically mined.
Diamonds are found around the world today, but more importantly the consumer should know that the diamond they are purchasing has come from an reliable source, free from conflict.

Consumers should purchase stones that they know have not supported any bloodshed in the rural areas where diamonds are sourced.
GIA’s introduction of the “Origin Certificate” has helped bridge the gap between industry and consumer, making the journey of diamonds more transparent.

To learn more click “GIA Origin” below.


Classic Diamonds

Classic diamonds are those that are colourless, or white in appearance. They are considered to be the rarest, are the most widely purchased, and are the only diamond that never goes out of fashion. 

The allure of the classic diamond is that of timlessness. A classic white diamond will surpass your life, they have no expiry date. It will be passed down from generation to generation, where in each sequential passing, it will be equally adored and loved by its admirer. 

Classic diamonds are a testament to the love, affection and story of its individual. They are emotion evoking not only for their aesthetic qualities, but because they are a symbol of unity and love. Two concepts that are fundamental in every human beings’ existence. Diamonds are – a symbol of your life. 

Classic diamonds are valued, because the mere sight of the striking lustre and sparkle it has, is breathtaking, mesmerising and fascinating. To conceptualise that this brilliant, luxurious and tantilising – yet extremely tiny diamond, came from a simple unprovoking rough and raw rock, is almost uncomprehensible. 

Fancy Colour Diamonds

World’s Rarest &  Most Emotion Evoking Diamonds

Fancy Colour Diamonds are diamonds with a colour, out of the normal colour range. The normal colour range is based on the “absence” of the colour because classic diamonds are considered to be colourless.

Different Fancy Colour Diamonds are formed when the carbon mineral is exposed to various other elements and conditions during formation.

The richest blue diamonds have been found to have higher concentrate of Boron. The more Boron evident the deeper the blue.

Green diamonds develop when radioactive rocks displace the carbon atoms from their normal positions in the diamonds crystal structure.

Yellow diamonds are the second most common Fancy Colour Diamond, and are developed from a concentrate of Nitrogen during formation.

All Fancy Colour Diamonds are considered to be rare as they fall out of the scope of colourless diamonds, but among the rarest, are red and blue diamonds. They are the most valuable of the coloured stones, often with values attached in millions of dollars depending on the size and colour saturation.

Fancy Colour Diamonds are often marketed with catchy terms – the “Canary Yellow Diamond” was developed to describe a strikingly strong yellow diamond for the consumer. Similarly diamonds with reddish hues have been marketed as “Rose Coloured Diamonds” and diamonds of purplish tint as “Mauve Diamonds”. 

While these terms serve to describe coloured diamonds in a very flamboyant manner, all Fancy Colour Diamonds are categorised into a scale from lightest to brightest (or darkest in colour concentrate). 

These are:
– Fancy Light
– Fancy
– Fancy Intense
– Fancy Vivid

Salt & Pepper

Most diamonds have flaws, which are imperfections or inclusions within the stone. Traditionally the diamond market has always looked to the rarest and finest quality of diamonds – being the most flawless stones. These are prized as the most valuable of the diamonds and make up the higher grade gem-quality production from mines. 

In recent years there has been an increasing trend in heavily included diamonds which have come to be known as “Salt & Pepper” diamonds. These stones are made from rough diamonds that would traditionally be rejected – such as near-gem quality, industrial diamonds or lower grade gem-quality diamonds that are not ideal for manufacturing purposes. 

Their inclusions vary in color, shape and sizes. These imperfetions may be carbon spots, cracks, feathers, clouds or even chips. Salt & Pepper diamonds usually contain a mix of black and white inclusions.
These heavily included stones are marketed as Salt & Pepper stones because it described the somewhat speckled and scattered appearance these stones have. The term salt refers to white inclusions and Pepper for black inclusions, making up the name Salt & Pepper. 

Salt & Pepper diamonds hold the reputation of “out of the ordinary”. These diamonds have become ingcreasily trendy in recent years, as consumers seek an unconventional diamond. These stones have an appeal of raw beauty to the beholder. Their owners find a sense of beauty in their flaws, which pairs almost fluently and beautifully in a rustic type of jewellery composition. 

Black Diamonds

Natural black diamonds get their colour from large quantities of mineral inclusions, or concentrations of clouds of these mineral inclusions dispersed internally through the stone, embodying the entire stone. The colour of the inclusions can vary from near-colourless, brown and to an olive-green, meaning that a natural black diamonds colour may not be entirely consistient in the distribution of its black colour.

Black diamonds are the only treated diamond that is widely accepted in the diamond trade today, because natural black diamonds of exceptional quality are so rarely available.
Irresistible Diamonds is able to source treated black diamonds and other special colours upon request.

Cognac Diamonds

Champagne diamonds or Cognac diamonds are essentially fancy brown diamonds. Their colour encompasses rich warm hues of brown, red , yellow and orange. These stones are not as valuable or rare as other fancy colour diamonds. Brown diamonds are the most common fancy colour. 

Champagne diamonds have known to be marketed as “Chocolate Diamonds”, describing their variation in intensity of brown from light to medium, and dark brown. The largest champaigne producing mine is the Argyle Diamond Mine in Western Australia. It is also known to be the world’s largest pink diamond producing mine in the world. 
Much like fancy coloured diamonds, these diamonds are graded on a scale of colour intensity of their own.
– Light Champagne: C1 – C2
– Medium Champagne: C3 – C4
– Dark Champagne: C5 – C6
– Cognac: C7

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