What is the ideal Table% for a round brilliant diamond?

The ideal Table% for a round brilliant diamond is between 54% and 57%. This range balances brilliance and fire, ensuring the diamond reflects the maximum amount of light.

What is the ideal Depth% for a round brilliant diamond?

The ideal Depth% for a round brilliant diamond is between 61% and 62.5%. This ensures the diamond appears as large as possible face-up while still returning maximum light.

What Crown and Pavilion angles should I look for in a round brilliant diamond?

For a round brilliant diamond, look for a Crown angle between 34° and 35°, and a Pavilion angle between 40.6° and 41°. The Crown angle controls fire and sparkle, while the Pavilion angle determines how much light is returned through the top of the stone.

What is the difference between a lab created and a natural round brilliant diamond?

Lab created round brilliant diamonds are grown in a controlled environment using the same carbon crystal structure as natural diamonds. They are optically, chemically, and physically identical to mined diamonds, but are typically available at a lower price point, allowing buyers to prioritise cut quality and carat weight.

What Girdle thickness is best for a round brilliant diamond?

A Girdle thickness of Thin to Slightly Thick is ideal for a round brilliant diamond. This protects the diamond's edge without adding unnecessary weight to the stone.

LAB CREATED DIAMONDS

Round Brilliant Diamonds

The round brilliant is the most popular diamond shape in the world, and for good reason. Its 57 carefully arranged facets are designed to maximise light return, giving it more fire and brilliance than any other shape.
It remains the only diamond shape to receive an official cut grade from the GIA — which means you have a reliable, standardised way to assess quality. However, a GIA Excellent grade covers a wide range, and roughly 55% of all round diamonds on the market carry that label. The proportions table is what separates the truly exceptional stones from the merely acceptable ones.

Lab created round brilliants offer the same exceptional optical performance as their mined counterparts – at a price point that lets you prioritise cut quality without compromise.

Beyond the 4Cs: Use the
proportions table to identify the
finest stones in our collection.

Proportion	Ideal range	Why it matters
Table %	54% – 57%	Balances brilliance and fire
Depth %	61% – 62.5%	Maximises face-up size
Crown angle	34° – 35°	Controls fire and sparkle
Pavilion angle	40.6° – 41°	Determines light return
Polish & symmetry	Excellent	Ensures no light is wasted
Girdle	Thin – Slightly thick	Protects the diamond’s edge