Diamonds are formed over billions of years, shaped by pressure, heat, and time deep within the earth. Each natural diamond carries its own conditions of origin, making no two stones exactly alike.
To understand a diamond’s quality, a universal framework is used: the 4Cs. Color, Clarity, Carat, and Cut. These criteria describe both the natural formation of the stone and the human craftsmanship that brings it to life.
A diamond’s character is always the result of both nature and human touch.
Color
In diamonds, color refers to the absence of it.
What we call a “white” diamond is in fact colorless. Perfectly colorless stones are rare, and most diamonds contain subtle tones of yellow, grey, or brown — often invisible to the untrained eye.
Color is graded on the internationally recognised D–Z scale, ranging from Colorless (D–F) to Light (S–Z). While the differences within the higher grades are delicate, they influence both rarity and value. A D-grade diamond represents the highest level of color purity.
Clarity
Diamonds are formed under immense natural pressure, which often leaves internal characteristics known as inclusions, and external marks called blemishes.
Clarity grading assesses the presence, size, and placement of these natural features. Absolute purity is extremely rare. As clarity increases, so does value, but inclusions are also part of what makes a diamond unique.
The clarity scale ranges from Flawless (FL) to Included (I1–I3), with several gradations in between.
Carat
Carat refers to a diamond’s weight, not its size.
Larger diamonds are rarer, which is why value increases disproportionately as carat weight rises. However, two diamonds of the same carat weight can differ significantly in value depending on their color, clarity, and cut.
One carat equals 0.2 grams and is measured with great precision.
Cut
Cut is the only aspect of a diamond fully shaped by human hands.
It determines how light moves through the stone, its brilliance, fire, and sparkle. Cut should not be confused with shape; it refers to proportion, symmetry, and craftsmanship.
Graded from Excellent to Poor, cut has the greatest visual impact of all the 4Cs. A well-cut diamond will appear more alive, even when other characteristics are less than perfect.
As designer and diamond expert Jade Trau notes:
“Looking at a diamond from across the room, you will always choose the beautifully cut stone, even over a flawless diamond with a poor cut.”
In conclusion
A diamond’s value is defined by the balance of all four characteristics. When making a considered choice, we place greatest emphasis on cut, as it most strongly influences how the stone is experienced in everyday wear.
Brilliance is not only about perfection, but about proportion, light, and movement.
