Diamond Cut

Diamond cut refers to how well a stone has been shaped and faceted, influencing its brilliance, fire, and overall sparkle.

Of all the 4Cs, cut is considered the most important, as it determines how light travels through the diamond. When a stone is cut with the right angles and proportions, light reflects back through the top, creating maximum brightness and scintillation.

A poor cut, on the other hand, allows light to escape through the sides or bottom, making the diamond appear dull. This is why even a diamond with excellent colour and clarity can look lifeless if the cut is not precise.

For lab-grown diamonds, we exclusively offer Excellent cut stones, ensuring every lab-grown diamond delivers the maximum brilliance possible.

It’s also worth noting that some jewellers market cuts using terms such as “Super Ideal” or “Signature Ideal.” These are not part of the internationally recognised GIA grading system, which only uses five cut grades: Excellent, Very Good, Good, Fair, and Poor.

This means that whether you choose a natural or a lab-grown round diamond with us, you can be confident it has been graded to the world’s most trusted standard.

(Princess, Emerald, Oval, Marquise, Radiant, Asscher, Pear, Heart, Baguette)

Diamonds cut in shapes other than round are known as fancy shapes. This includes popular styles such as Princess, Emerald, Oval, Marquise and many more.

Unlike round diamonds, fancy shapes do not receive an official cut grade. Instead, they are assessed by their polish and symmetry – measures of how carefully the facets and proportions have been finished. At Purely Diamonds, we select fancy shape diamonds with polish and symmetry of at least ‘Good’, and most are graded ‘Very Good’ or higher.

The reason there is no universal cut grade for fancy shapes is that their proportions can vary widely. While round diamonds are consistently symmetrical, fancy shapes can have countless variations in length, width, depth and outline – each creating its own unique character.

This means you can confidently choose the diamond shape you love most, knowing its beauty and quality are always assured.