The Diamond Trading Company, which historically controlled the world’s diamond supply, is not only famous for the expression a ‘Diamond is Forever’, but also developing the 4 C’s as a way to judge diamonds. The 4 C’s guide your judgement but there is more to consider when you are selecting a diamond ring, whether you are an expert or a novice.


Cut is probably the most important, and most challenging, of the four Cs to understand. The brilliance of a diamond depends heavily on its cut.
Most diamonds contain some inner flaws, or inclusions, that occur during the formation process. The visibility, number and size of these inclusions determine what is called the clarity of a diamond. Diamonds that are clear create more brilliance, and thus are more highly prized, and priced.
Colourless diamonds are the most desirable since they allow the most refraction of light (sparkle). Off white diamonds absorb light, inhibiting brilliance.
A carat is the unit of weight by which a diamond is measured. Because large diamonds are found less commonly than small diamonds, the price of a diamond rises exponentially to it’s size. Read this guide to get a better understanding of what a carat is and how it affects the appearance of a diamond.