“The Four C’s” a guide to buying diamond jewellery

Buying a diamond is a purchase most people make only a few times in a lifetime. Since this is such a rare and valuable purchase it is important that you have expert advice and guidance to help you to the correct choice. 


To transform the diamond into a beautiful gem, it is cut with precise facets.  Well cut diamonds have amazing brilliance and fire.  This is caused by light reflecting off the diamond’s surfaces.  The key to desirable fire and brilliance is proportion.  Light striking a shallow cut diamond or a diamond cut too deep is lost through the sides or bottom and is not reflected back to the top.


Clarity is an indication of a diamond’s purity. Determined by naturally occurring internal characteristics called inclusions.  Most diamonds contain tiny internal marks, these are like natural birthmarks and can vary in size and concentration. Complete freedom from these inclusions is very rare and these are called flawless diamonds.


Diamonds are measured in terms of weight, not size.  One carat is equal to 100 points.  Two diamonds of equal weight can have very different values, because the quality is still determined by the colour, clarity and cut.  In this aspect bigger is not always better. Other features all being equal -  a bigger stone will be more expensive, but a smaller stone could easily out-price a large stone which has been poorly cut and of poor colour and clarity. As larger stones are more rare this does affect price, double the weight for example will be far in excess of double the price providing all other features are equal.


While many diamonds appear colourless or white, they may actually have subtle yellow or brown tones that can be detected when comparing diamonds side by side.

Colourless diamonds are the rarest and most valuable of all.