Which Diamond Shape Has the Most Fire and Dispersion?
When it comes to diamonds, there’s more to consider than just size or sparkle.
In short: The round brilliant produces the most fire (rainbow colour flashes from dispersion) thanks to its 57-58 facets and optimal crown angles — leveraging diamond's intrinsic 0.044 dispersion. Old European and old-mine cushion cuts deliver higher visible fire due to smaller, deeper facets. Moissanite tops diamond on dispersion (0.104). UK 2025 buyers pay £1,400-£1,800 for a 1.00ct lab-grown D/VS1 Excellent-cut round.
Two important characteristics often overlooked are fire and dispersion, which add depth and life to a diamond’s beauty.
But which diamond shape truly maximises these qualities? Let’s explore what fire and dispersion mean, how they influence a diamond’s appeal, and which shapes bring out the most captivating colours and flashes.
Understanding Fire and Dispersion in Diamonds
Before we dive into the best diamond shapes for fire and dispersion, it’s essential to understand these terms.
What Is Diamond Fire?
Diamond fire refers to the colourful flashes of light you see when a diamond catches the light just right.
When a diamond’s facets refract light, it breaks down into its spectral colours, resulting in those dazzling flashes of red, blue, yellow, and other hues.
The more intense the fire, the more captivating the diamond appears, as it shimmers with a spectrum of colours.
What Is Dispersion in Diamonds?
Dispersion is closely related to fire, as it’s the process of splitting white light into its individual colours when it passes through the diamond.
