LeGassick Diamonds & Jewellery Gold Coast, Australia
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The Science of Sparkle: Understanding Light Performance in Diamonds

The Science of Sparkle: Understanding Light Performance in Diamonds

Diamonds have fascinated us for centuries with their brilliance and fire. But what exactly makes a diamond sparkle so brilliantly? In this blog post, we explore the science behind light performance in diamonds and how different cuts and settings can enhance their natural beauty. Understanding these factors will help you make an informed choice when selecting your perfect diamond from LeGassick.

The Importance of Light Performance

Light performance refers to how well a diamond interacts with light to produce brilliance, fire, and scintillation. These three elements are key to a diamond’s overall sparkle:

  • Brilliance: The white light reflected from the diamond’s surface and interior.
  • Fire: The dispersion of light into various colours of the spectrum.
  • Scintillation: The flashes of light and dark that occur when the diamond or light source moves.

Achieving optimal light performance in a diamond depends largely on its cut quality and setting.

The Role of Diamond Cuts

The cut of a diamond is crucial to its light performance. While many people think of shape when they hear "cut," such as round, princess, or emerald, cut actually refers to how well the diamond’s facets are proportioned and aligned. Here’s how different aspects of the cut affect a diamond’s sparkle:

1. Proportions

The proportions of a diamond—such as the depth, table, and crown angles—determine how light travels through it. A well-proportioned diamond will reflect most of the light back through the top, maximising brilliance and fire. If the diamond is cut too deep or too shallow, light can escape through the sides or bottom, reducing its sparkle.

2. Symmetry

Symmetry refers to how precisely the facets of a diamond are aligned and proportioned. High symmetry ensures that light is evenly distributed throughout the diamond, enhancing its overall sparkle. Even slight deviations can affect light performance and diminish the diamond’s brilliance.

3. Polish

The polish of a diamond affects how smoothly light passes through its facets. A well-polished diamond will have a mirror-like finish, allowing light to reflect cleanly off its surfaces. Poor polish can create microscopic scratches or blemishes that scatter light and reduce brilliance.

The Impact of Settings on Light Performance

In addition to the cut, the setting of a diamond also plays a significant role in its light performance. The right setting can enhance a diamond’s natural sparkle, while a poor setting can detract from its beauty. Here are a few popular settings and how they affect light performance:

1. Prong Setting

The prong setting is one of the most common and classic ways to mount a diamond. It uses metal prongs to hold the diamond in place, allowing maximum light to enter and reflect from the diamond’s facets. This setting enhances brilliance and scintillation by minimising obstruction to light.

2. Bezel Setting

A bezel setting encircles the diamond with a metal rim, offering excellent protection. While it may slightly reduce the amount of light entering the diamond compared to a prong setting, it can still showcase a diamond’s brilliance effectively, especially with a well-cut stone.

3. Halo Setting

A halo setting surrounds the central diamond with smaller accent diamonds. This design not only adds extra sparkle but also makes the central diamond appear larger. The additional diamonds increase the overall light performance, creating a dazzling display of brilliance and fire.

4. Pavé Setting

In a pavé setting, small diamonds are set closely together, covering the band or other parts of the jewellery piece. This setting enhances the overall sparkle by reflecting light from multiple angles, adding to the diamond’s scintillation.

LeGassick: The Pinnacle of Natural Beauty

At LeGassick, we specialise in high-end natural diamonds that are crafted with precision to ensure exceptional light performance. Each diamond is meticulously cut and polished to maximise brilliance, fire, and scintillation. Our expert jewellers can help you choose the perfect cut and setting to enhance the natural beauty of your diamond, ensuring that it sparkles brilliantly for a lifetime.


Understanding the science of light performance in diamonds can help you appreciate the true beauty of these magnificent gems. Whether you’re drawn to the timeless elegance of a prong setting or the dazzling effect of a halo design, LeGassick offers a range of expertly crafted, high-end natural diamonds that capture the essence of sparkle. Explore our collection today and find the perfect diamond that shines as brightly as your love.