Everything you ever wanted to know about Diamonds *

* But were afraid to ask

Introducing the 4C's

At first glance, engagement rings seem like such simple things. A diamond, some shiny metal, a nice box, maybe an engraved message and that’s it.

When you begin the process of buying an engagement ring however, you learn that it’s anything but simple! As well as the big decisions like which metal, stone, shape, cut, and setting you want, there’s several other things to think about: the metal finish, your budget, the rings style.

Take a deep breath, put the kettle on and take some time to read our guide to the perfect ring.

If its all a bit too much right now, don't worry, our qualified Diamond grader will be more than happy to talk you through them, you can always refer back to the guide at a later time.

The key here is take your time, if your not sure, don't hesitate to ask and remember, what we want is for you to have not only the most beautiful ring for your partner but something that won't break your budget.

There is a 5th C, its Confidence, all of the stones we use are certified or graded by internationally accredited bodies such as GIA and IIDGR.

Lets begin

First, a geology lesson: diamonds are 99.95% pure crystallised carbon and are extremely old - between one to three billion years old. They are the hardest naturally occurring substance known and are formed some 100 and 150 miles beneath the Earth's surface when crystals of diamond occur in volcano feed-pipes.

When volcanoes erode down, they release diamonds from their feed-pipes into layers of gravel which are later mined. However, due to the relative rarity of this natural process, diamond mines are found in just a handful of sites around the world.

In rough form, diamonds are shipped to the world's cutting centres to be shaped and polished before being set as jewellery. It is the hardness, brilliance and sparkle that emerges during this process that transforms them into a girl's best friend.

The 4 Cs – Cut, Colour, Clarity and Carat provide a way of grading & certifying diamonds. It is these characteristics that determine the value, rarity and beauty of every diamond. Understanding the 4 Cs is a key part of choosing the right diamond for your taste and budget.

Once you've familiarised yourself with each of the 4 Cs, you will be able to decide which ones are the most important to you when making your choice.

Until the middle of the twentieth century, there was no agreed-upon standard by which diamonds could be judged. The Gemological Institute of America created the first, and now globally accepted standard for describing diamonds: Colour, Clarity, Cut, and Carat Weight. Today, the 4Cs of Diamond Quality is the universal method for assessing the quality of any diamond, anywhere in the world.

The creation of the Diamond 4Cs meant two very important things: diamond quality could be communicated in a universal language, and diamond customers could now know exactly what they were about to purchase.

We would however suggest you consider a 5th C - Certification, further ensuring that your diamond is exactly the stone you want and offering additional confidence in the purchase.

In recent years, lab grown diamonds have grown in popularity, read on for more information.

The Cut

Cut refers not to a diamond's shape (e.g. round, oval, pear, etc.) but to a diamond's proportions, symmetry and polish. The beauty of a diamond depends more on cut than any other factor. Though extremely difficult to analyse and quantify, diamond cut has 3 primary effects on appearance: Brilliance (the brightness created by the combination of all the white light reflections from the surface and the inside of a polished diamond), Fire (the dispersion of light into the Colours of the visible spectrum, seen as flashes of colour), and Scintillation (the flashes of light and dark, or sparkle, when a diamond or light source is moved).

When a diamond is fashioned from a rough stone, the cutter must balance optimal cut (and therefore appearance) against maximum yield (cutting the diamond to maintain as much carat weight from the rough stone as possible). Because many customers are willing to pay more for a larger, fair-cut cut diamond than for a slightly smaller, well-cut diamond, there is pressure on the cutter to sacrifice appearance for weight. This is why the Cut grade is so important; it allows the purchaser to identify those stones that were cut Fair to Poor in an effort to gain carat weight.


Diamond proportion refers to the relationship between the size, shape, and angle of each facet of a diamond. A wide range of combinations are possible, ultimately determining the diamond's interaction with light.

When light strikes a diamond, approximately 20% immediately reflects off the surface (as glare). Of the 80% that enters, a portion will escape through the bottom of the diamond (where the observer cannot appreciate it). A well proportioned diamond will have each facet properly placed and angled so as to maximize the amount of light that reflects back out of the crown (top) of the diamond, to the eye of the observer. This reflected light is perceived as scintillation, fire and brilliance.

Most gemologists agree that the best cut diamonds are those that follow a set of formulae calculated to maximise brilliance. These formulae can be seen in a diamond's proportions, most importantly how the depth compares to the diameter, and how the diameter of the table compares to the diameter of the diamond.

However, the variance in the proportions between an Ideal Cut and a Poor Cut can be difficult to discern by the casual observer. Because cut is so important, several grading methods have been developed to help consumers determine the cut of a particular diamond. In general, these grades are:

Ideal Cut

This cut is intended to maximise brilliance, and the typically smaller table sizes of these diamonds have the added benefit of creating a great deal of dispersion or 'fire' as well. Ideal quality diamonds are truly for the person who enjoys knowing that he has one of the finest things that money can buy. This category applies only to round diamonds.

Very Good

These diamonds reflect most of the light that enters them, creating a good amount of brilliance. With these diamonds, the cutters have chosen to stray slightly from the preferred diamond proportions in order to create a larger diamond.

The result is that these diamonds fall slightly outside of some customers' preferences in terms of, for example, table size or girdle width, though in many cases, many of the parameters of diamonds in this range will overlap with certain parameters of diamonds in the Ideal or Premium ranges. Generally, the price of these diamonds in slightly below that of Premium cuts.


In the case of round diamonds, many Premium Cut diamonds have cuts that are the equal of any Ideal Cut diamond, though they often can be purchased at slightly lower prices than Ideal Cuts. They are intended to provide maximum brilliance and fire. Like the Ideal Cut, these are also for the person who enjoys knowing that he has one of the finest things that money can buy.


Diamonds that reflect much of the light that enters them. Their proportions fall outside of the preferred range because the cutter has chosen to create the largest possible diamond from the original rough crystal, rather than cutting extra weight off to create a smaller Premium quality diamond. Diamonds in this range offer excellent cost-savings to customers who want to stay in a budget without sacrificing quality or beauty.

Fair & Poor

A diamond graded as fair or poor reflects only a small proportion of the light that enters it. Typically these diamonds have been cut to maximise the carat weight over most other considerations.


Anatomy of a diamond

The width of the diamond as measured through the girdle.
This is the large, flat top facet of a diamond.
The upper portion of a cut gemstone, above the girdle.
The narrow rim of a diamond that separates the crown from the pavilion. It is the largest diameter of any part of the stone.
The lower portion of the diamond, below the girdle. It is sometimes referred to as the base.
The tiny facet on the pointed bottom of the pavilion, which is the portion of a cut gem below the girdle.
The height of a gemstone, from the culet to the table.

Diamond Clarity

Because they are formed deep within the earth, under extreme heat and pressure, virtually all diamonds contain 'birthmarks'; small imperfections inside the diamond (called inclusions) or on its surface (called blemishes).

Clarity refers to the degree to which these imperfections are present. Diamonds which contain numerous or significant inclusions or blemishes have less brilliance because the flaws interfere with the path of light through the diamond.

The position of an inclusion affects how easily it can be seen. Diamond cutters make every effort to cut a stone so that inclusions are not visible through the table of the finished diamond.

The preferred position for inclusions is under the bezel facets or near the girdle because they are harder to see there.

Almost all diamonds are graded for clarity using the 11 point diamond clarity scale created by the GIA, including diamonds which were not actually graded by GIA (every diamond we use is GIA certified). In grading diamond clarity, the GIA considers the number, size, colour, reflectivity, and position of every flaw visible under 10x magnification.


Flawless: No inclusions or blemishes are visible to a skilled grader using 10x magnification.

Extremely rare; less than 1 in 5,000 jewellery quality diamonds are rated FL.


Internally Flawless: No inclusions, only blemishes are visible to a skilled grader using 10x magnification.

FL and IF diamonds appear identical unless viewed under 10x magnification by a skilled grader. Less than 3% of jewellery quality diamonds are rated IF.


Very, Very Slightly Included: Inclusions are difficult for a skilled grader to see under 10x magnification.

VVS1 inclusions are typically only visible from the pavilion, while VVS2 inclusions are visible from the crown. In each, the inclusions are invisible to the eye, appearing identical to the higher grades unless viewed under 10x magnification by a skilled grader.


Very Slightly Included: Inclusions are clearly visible under 10x magnification but can be characterised as minor.

Inclusions are not visible to the naked eye. Perhaps 1 in 100 untrained observers can detect VS2 inclusions with the naked eye, on close inspection under ideal conditions.


Slightly Included: Inclusions are noticeable to a skilled grader using 10x magnification.

SI1 is the lowest grade with flaws often invisible to the naked eye. SI2 inclusions are usually visible to the naked eye, although they will require close inspection.


Included: Inclusions are obvious under 10x magnification and may affect transparency and brilliance.

I1 diamonds have inclusions that are almost always visible to the naked eye. I2-I3 diamonds have pronounced inclusions, and in the case of I3 may even affect the diamond's durability.

Carat Weight

Diamond carat weight is the measurement of how much a diamond weighs.

A metric "carat" is defined as 200 milligrams.

Each carat can be subdivided into 100 'points.' This allows very precise measurements to the hundredth decimal place. A jeweller may describe the weight of a diamond below one carat by its 'points' alone. For instance, the jeweller may refer to a diamond that weighs 0.25 carats as a 'twenty-five pointer.' Diamond weights greater than one carat are expressed in carats and decimals. A 1.08 carat stone would be described as 'one point oh eight carats.'

All things being equal, diamond price increases with diamond carat weight, because larger diamonds are rarer and more desirable. But two diamonds of equal carat weight can have very different values (and prices) depending on the other diamond 4Cs: Clarity, Colour, and Cut.

The average size of most engagement-ring diamonds is somewhere between one carat and half a carat.

Do not confuse carats with karats, the unit of purity for gold.

How did the carat system start?

The modern carat system started with the carob seed. Early gem traders used the small, uniform seeds as counterweights in their balance scales. The carat is the same gram weight in every corner of the world.

The word "carat" was possibly derived from the Greek word kerátion literally meaning a small horn, and refers to the carob seed as a unit of weight.

What are "magic sizes"?

Some weights are considered "magic sizes" – half carat, three-quarter carat, and carat.

Visually, there is little difference between a 0.99 carat diamond and one that weighs a full carat.But the price differences between the two can be significant.

Jewellery Repairs


Diamonds come in a variety of colours, some of them highly prized (pinks, blues, even yellow). In a white diamond, however, the presence of a yellow tint will lower the price of a diamond. The less body colour in a white diamond, the more true colour it will reflect, and thus the greater its value.

Diamonds are assigned a colour grade by the GIA in a viewing environment specially designed to eliminate colour from surrounding surfaces as well as the light source itself.

This allows the colour of the diamond to be accurately measured. Minor differences in diamond colour detected in this environment are very difficult, if not impossible, to detect in a normal environment.

The diamond industry has adopted the GIA diamond colour scale; almost every diamond sold today is rated using the GIA colour scale, whether it was actually certified by the GIA or not.

Colourless D E F

While there are differences in colour between D, E, and F diamonds, they can be detected only by a gemologist in side by side comparisons, and very rarely by the untrained eye.

D-F diamonds should only be set in white gold / platinum. Yellow gold reflects colour, negating the diamond's colourless effect.

diamonds to your desk

D to F

Near Colourless G H

While containing traces of colour, G-J diamonds are suitable for a platinum or white gold setting, which would normally betray any hint of colour in a diamond.

Because I-J diamonds are more common than the higher grades, they tend to be better value. An I-J diamond may retail for half the price of a D diamond. Within the G-J range, price tends to increase 10-20% between each diamond grade.

diamonds to your desk

G to H

Faint Colour

Beginning with K diamonds, colour (usually a yellow tint) is more easily detected by the naked eye. Set in yellow gold, these warm coloured diamonds appeal to many, and are exceptionally valuable.

Due to its perceptible colour tint, a K diamond is often half the price of a G diamond.

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I to J

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K to M

Very Light Colour

Diamonds in the N-R colour range have an easily seen yellow or brown tint, but are much less expensive than higher grades.

For almost all customers, S-Z diamonds have too much colour for a white diamond.

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N to R

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S to Z

What is ultraviolet fluorescence?

Fluorescence is the visible light some gemstones emit when they are exposed to invisible ultraviolet (UV) rays. In natural diamonds, blue is the most common colour of fluorescence, but other colours may be visible.
On a GIA Diamond Grading Report, fluorescence refers to the strength, or intensity, of the diamond’s reaction to long-wave UV, which is an essential component of daylight.


Colour becomes much harder to detect once a stone is set in a ring and placed in an environment that contains colour (as opposed to the all white background used in diamond colour grading). For instance, an H colour diamond may look as colourless as a D when set in a ring under normal lighting conditions, especially if the two are not compared side by side.

Another factor that affects a diamonds's apparent colour is the colour of the mounting itself. Yellow gold makes slight amounts of yellow in a diamond less obvious, while white metal mountings make the colour in yellow diamonds more apparent.

The vast majority of untrained observers (and many gemologists) cannot distinguish a colour grade from the one just above or below unless the diamonds are compared side by side in a controlled environment.

Colour becomes more important as carat weight increases. Colour is easier to perceive in a larger diamond, just as a carafe of white wine shows more colour than a single glass.


The Gemological Institute of America, or GIA, is a nonprofit institute dedicated to research and education in the field of gemmology and the jewellery arts.

Founded in 1931, GIA's mission is to protect all buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality. The Institute does so through research, gem identification, diamond grading services and a variety of educational programs.

Through its world-renowned library and subject experts, GIA acts as a resource of gem and jewellery information for the trade, the public and worldwide media outlets.

In 1953, the GIA developed its International Diamond Grading System and the Four Cs (cut, clarity, colour, and carat weight) as a standard to compare and evaluate the quality of diamonds.

Today, the institute is headquartered in Carlsbad, California and operates out of 13 countries, with 11 campuses, 9 laboratories and 4 research centres worldwide.

The GIA set the standard for diamond grading and gemmological identification, and their grading system serves as the international gem and jewellery industry's benchmark credentials.

Shape and Cutting Style: The diamond shape and cutting style.

Measurement: Lists the diamond's dimensions in millimetres.

Carat Weight: The weight of diamond listed to the nearest hundredth of a carat.

Colour Grade: A grading which assesses the absence of colour in a diamond.

Clarity Grade: Clarity grade determined under 10x magnification.

Cut Grade: A grade of cut as determined by a diamond's face-up appearance, design and craftsmanship. A cut grade is available on round diamonds graded after Jan. 1, 2006.

Finish: Grades that represent a diamond's surface and facet placement.

Polish: Rating the overall smoothness of the diamond's surface.

Symmetry: Measuring the shape, alignment and placement of the diamond's facets in relation to one another as well as the evenness of the outline.

Fluorescence: Colour, and strength of colour when diamond is viewed under UV light.

Comments: A description of additional diamond characteristics not already mentioned in the report.

Clarity Plot: A map of the approximate size, type, and position of inclusions as viewed under a microscope.

Proportion Diagram: A map of the diamond's actual proportions.

GIA Sample Report

Lab Grown or Mined Diamonds?

The decision to choose a natural or lab-grown diamond for your engagement ring ultimately depends on your personal values and preferences. Here are some factors to consider:

Cost: Lab-grown diamonds are typically less expensive than natural diamonds. If cost is a major concern, a lab-grown diamond may be the better choice.

Ethics: Some people prefer lab-grown diamonds because they are produced in a more environmentally and socially responsible way than natural diamonds, which can be associated with human rights abuses and environmental damage.

Rarity: Natural diamonds are rare and have a long history of being prized for their beauty and value. If you are looking for a stone that has a unique history and rarity, a natural diamond may be more appealing to you.

Quality: Both natural and lab-grown diamonds can be of high quality, but natural diamonds are typically more consistent in their clarity and colour. If you are looking for a stone with the highest possible quality, a natural diamond may be the better choice.

Ultimately, the choice between a natural or lab-grown diamond comes down to what is most important to you. Both options can be beautiful and meaningful in their own ways, so consider your values and priorities before making a decision.

How is a lab grown diamond produced?

Lab-grown diamonds are produced through a process called Chemical Vapour Deposition (CVD) or High Pressure High Temperature (HPHT) method. Here are the steps involved in producing a lab-grown diamond using the CVD method:

A diamond seed is placed in a vacuum chamber that is filled with a gas mixture, usually consisting of methane and hydrogen.

The chamber is heated to around 800 to 900 degrees Celsius and the gas mixture is ionised by a plasma torch, which breaks down the methane molecules into their component carbon and hydrogen atoms.

The carbon atoms then deposit onto the diamond seed, gradually building up layers of diamond crystal.

The process continues for several days, until a diamond of the desired size and quality is formed.

The diamond is then cut and polished just like a natural diamond.

The HPHT method uses a press that mimics the extreme conditions of the Earth's mantle, where natural diamonds are formed.

A small diamond seed is placed in a capsule along with a carbon source and a metal catalyst, and then subjected to high pressure and high temperature conditions. This causes the carbon to dissolve and precipitate onto the diamond seed, gradually building up layers of diamond crystal.

Both methods result in diamonds that are chemically, physically, and optically identical to natural diamonds, but with a different origin.

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