Excellent
Precisely proportioned to return the maximum amount of light through the top of the diamond. This creates exceptional brilliance, fire and sparkle, giving the stone its bright, lively appearance.
Diamond Cut & Light Performance
Understanding What Makes a Diamond Exceptional
A diamond’s proportions determine how effectively light travels through the stone and returns to the eye. A well-proportioned cut maximises brilliance, fire and sparkle, while proportions that are too deep or too shallow allow light to escape.
Good
Well proportioned with strong overall brilliance and sparkle, although some light escapes rather than returning through the top of the diamond. The difference can be subtle, but becomes more apparent alongside an Excellent cut.
Deep
When a diamond is cut too deep, light travels at less effective angles and escapes through the sides or base of the stone. This reduces light return and can make the diamond appear darker and smaller than its carat weight suggests.
Shallow
When a diamond is cut too shallow, light passes through the stone and escapes through the base instead of reflecting back towards the eye. The result is reduced brilliance, contrast and sparkle, often giving the diamond a flatter appearance.
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Ideal Proportions
We consider a diamond’s proportions together rather than in isolation, seeking the balance that allows the stone to perform beautifully.
Table
54% – 58%
The table influences how light enters and returns through the diamond. Beautiful proportions create an elegant balance of brilliance and fire.
Depth
59.0% – 62.6%
Depth determines the diamond’s overall proportions and face-up presence. The right balance helps the stone appear beautifully sized and refined.
Girdle
Thin – Slightly Thick
The girdle forms the diamond’s delicate outer edge. The ideal thickness balances refined proportions with lasting strength and security.
Culet
None
The culet is the smallest point at the base of the diamond. Ideally discreet, it preserves the stone’s seamless face-up beauty.
Crown Angle
34.0° – 35.0°
The crown angle shapes how a diamond captures and disperses light. Beautiful proportions enhance its fire, brilliance and character.
Pavilion Angle
40.6° – 41.0°
The pavilion angle is fundamental to exceptional light return. Precise proportions allow light to travel through the diamond with remarkable brilliance.
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