Considering buying diamonds for yourself or a loved one? This blog will teach you the 4 C's of diamonds.

When it comes to buying the perfect diamond jewellery for a loved one or yourself, whether it be a ring, necklace or earrings, you’ll no doubt want to do a bit of research to ensure you’re purchasing a piece that will stand the test of time. Enter the four Cs of buying diamonds: Cut, clarity, colour and carat.

You’ve no doubt heard these terms thrown about before, but what do they really mean? Find out with this overview.


A diamond’s cut largely determines its brilliance – the brightness that exudes from the heart of the diamond. The cut includes its angles and finish, all of which contribute to the stone’s ability to handle light.

The cut has less to do with the shape of the diamond, and more to do with its proportions. A correctly cut stone is one with angles corrected so that light enters and is dispersed properly through the top facets of the stone. A diamond with a cut too shallow or deep will allow light to escape through the bottom of the diamond, meaning some of its brilliance is lost.

Stack of diamond engagement rings from Passsion8 Diamonds.
Gorgeous engagement rings by Passion8 Diamonds


Diamonds come in a huge range of colours, but it is the colourless stones that are the most desirable. This is because they allow the most light refraction, giving the stone its sparkle. Off-white diamonds are less popular as they absorb light.

Diamonds are graded in terms of colour from totally colourless to light yellow.


The number and location of flaws on a diamond determines its clarity. Those with few flaws are more brilliant and therefore fetch a higher price.

Diamond ring
Stunning diamond ring

Diamonds are viewed under 10-power magnification to be awarded a clarity grade from Flawless to Imperfect 3.


Diamonds are measured in carats, a unit of weight. As heavier, larger diamonds are much rarer than small ones, the price of these more prized jewels rises exponentially to match its size.