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THE Five C'S

A combination of the 5C's - Cut, Colour, Clarity, Carat & Certificate - determines the value of a Diamond.

1. Diamond Cut

There are a number of different shapes of cut. Brilliant, Princess, Radiant, Asscher, Emerald and Pear are some examples. Whereas the round brilliants are cut to a specific ideal proportion often other cuts in particular the fancy cuts can be longer or shorter depending on your personal preference.

The cut of a Diamond is often confused with the shape however it is the proper proportions of the stone and the accurate alignment of the facet edges that are graded. In order to reflect all of the light, a well cut Diamond should have great proportions so it performs with the upmost sparkle and not look dull or lifeless.

2. Diamond Colour

The most desirable colour when referring to Diamonds is actually white or colourless, the colour scale is graded on letters and starts at D, as you go down the scale you will start to see a faint tinge of yellow or brown. Diamonds of very close colour grading can be difficult to determine between to the untrained eye and colours from D down to H tend to be the most desirable as these are in the white/colourless bracket. When we talk about yellow diamonds these are not low coloured diamonds but actually yellow in colour and are very desirable.

3. Diamond ClarityThe clarity of a Diamond is dependent upon the included particles within the stone which are seen in various forms such as clouds and feathers to name but a few. Most Diamonds contain minute inclusions that occur when they are formed by nature, almost like birthmarks. It is not only the size and quantity of any marks within a stone that is important but also the positioning of any inclusions within the stone, all these factors will help determine the value.

4. Carat

Carat is a measure of the weight of the stone. The weight of one carat is precisely 0.2 grams, they are usually referred to in points, whereby 100 points make up 1 carat. Therefore a half carat stone can also be described as 0.50 points, and a 3/4 carat stone has 0.75 points.

As a carat is a unit of weight and not size, two diamonds of the same carat weight may appear to be different sizes.

5. Diamond Certificate

The vast majority of our diamonds have been independently graded and certificated by a recognised independent gemological institute.

Phillip Stoner tends to use one of the following Independent Laboratories: The Gemological Institute of America (GIA), The International Gemological Institute (IGI), HRD Antwerp and AnchorCert (Birmingham Assay Office)


Phillip Stoner acquires all our diamonds through The Kimberley Process, which guarantees that every stone we purchase is from conflict-free zones.

Our membership of an international buying network enables us to purchase diamonds of any cut, weight, clarity or colour, at prices we believe can beat other high street jewellers. We are happy to give you a quote on any type of loose diamond.Please email us, including any quote you may have already been given, and we will contact you with a price we’re sure you’ll be delighted with.