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From colour to clarity, we cover all the key points you will need to consider when it comes to selecting the perfect diamond in our Diamond Guide. 


Welcome to Joshua James' diamond guide. If you’ve researched engagement rings at all, you’ll have no doubt stumbled across the phrase “the 4 C’s”. If you are opting for a diamond engagement ring, the 4 C’s should be your basis for studying and selecting a diamond based on its quality and beauty. You'll see throughout this diamond quality guide that the 4 C’s are factors that contribute to the value and rarity of a diamond, and they are cut, clarity, carat and colour.


Firstly in our buying diamond guide is the colour. Quite simply, this refers to the colour of your diamond. The most valuable diamonds have no colour at all, but shades can range from clear through to a light yellow. Truly colourless diamonds are rare, and are therefore treasured for their quality and beauty. 

However as trends move towards more unusual and unique engagement rings, this has caused an increase in demand for alternative coloured diamonds. There has been a rise in the popularity of the yellow diamond, making them more valuable than they have been historically.

The grading of colour runs backwards from letters of the alphabet Z-D: a diamond graded D is colourless, therefore the highest quality grade, while one graded Z will appear slightly yellow.

You can see each grade of colour in-detail below;

D - Absolutely colourless, the highest colour grade and extremely rare.

E/F -Colourless and a rare, small traces of colour can be detected by an expert gemmologist.

G/H - Almost colourless, often difficult to detect unless compared to better grade diamonds of better grades.

I/J - Near colourless and good value with slightly detectable warmth or tone.

K/Z - Noticeable saturation.


Next up in our diamond guide, we have the cut. The cut of a diamond refers to its proportions and how the facets on the surface of the diamond are placed, determining its overall brilliance and sparkle. 

When a diamond is cut well the light rays are reflected up through the top of the stone, giving a blaze of light and spectrum colours. But if a diamond is badly cut then the light rays leak through the bottom and sides of the stone, making it appear dull which affects the sparkle.

Please keep in mind the ‘Cut’ of a diamond is different to the ‘Shape’; the two can quite often be confused. You can read more about the shape of diamonds and gemstones in our engagement ring guide


A diamond’s clarity is graded on a scale ranging from ‘Flawless’, signifying no internal or external imperfections, to ‘Included’.

These ‘imperfections’ (or ‘inclusions’) are totally natural and can be caused by the pressure which is placed on diamonds as they for. However, they can interfere with the passage of light through the stone. Flawless diamonds are exceedingly rare and priced accordingly.

Most often, the inclusions in a diamond can only be spotted through professional magnification, meaning the clarity of your diamond will not necessarily affect the beauty of the stone to the naked eye.

Historically people would stay away from diamonds with 'imperfections' but trend changes have lead to a rise in popularity for the 'imperfect diamond'. We are now seeing more rings featuring a 'salt & pepper' diamond, which put a focus on these inclusions.

See the different clarity grades below in the next part of our diamond guide;

FL - Flawless with no visible blemishes

IF - Internally flawless with very slight blemishes

VVS1, VVS2 - Very, very slightly included

VVS1 - Few miniscule inclusions

VVS2 - Slightly more miniscule inclusions

VS1, VS2 - Very slightly included. Minor inclusions ranging from difficult to somewhat easy to see.

SI1, SI2 - Slightly included.

SI1 - Has inclusions and are occasionally visible to the keen eye without magnification

SI2 - Inclusions are typically visible from the pavilion, and often seen from the top without magnification

I1 - Included


Often mistaken as the size of the diamond, the carat is actually a measure of a diamond's weight. The higher the carat, the heavier the diamond (and the heftier the price tag!). 

If the ring you choose features a cluster of diamonds, all diamonds are weighed together to produce the overall carat of the item of jewellery.

We hope that this diamond guide and overall carat guide was helpful. Continue exploring our site for other guides that we have created to guide our customers to their dream jewellery pieces.