The 4Cs of a diamond – Cut, Clarity, Colour, and Carat – are the globally accepted standards for assessing a diamond's quality.
Cut refers to how well a diamond has been cut from its raw form. It impacts how well the diamond sparkles.
Clarity measures the tiny imperfections or 'inclusions' within the diamond. No diamond is perfectly pure, but the closer it comes, the higher its value.
Colour refers to the presence of any colour in a diamond, with the most valuable diamonds being completely colourless.
Carat is the measure of a diamond’s weight. Larger diamonds are rarer and hence more valuable.