Diamonds are crystals made up of a single element: pure carbon.

The price of a diamond is based on four main criteria, known as the 4 Cs: Carat (weight), Colour (colour), Clarity (purity) and Cut (size/shape).

Diamonds are renowned for their extreme hardness, achieving a maximum score of 10 on the Mohs scale (which measures the hardness of minerals).

Diamond is therefore the hardest substance there is, and nothing can scratch it except another diamond. This is why diamonds are used not only in jewellery, but also in industry, as they have the ability to scratch or cut through any other material.