What makes a diamond sparkle?

16/04/2020 Uncategorized

There’s nothing quite like a diamond: everything from its vibrant, clear aesthetic to its strength and durability are remarkably unique. But what truly defines a diamond as the world’s most desired gem is undoubtedly its sparkle: the way a diamond works with light to create a shine that captures our attention and our hearts. So, what makes a diamond sparkle? 

A diamond immediately shiny when it is extracted from the earth. At this early stage, it’s simply a translucent rock. In fact, the burst of sparkle we all know and love is the result of two things: how the diamond is cut, and how light hits the diamond after it’s cut. 

Marcel Tolkowsky founded the diamond’s sparkle

Physicist Marcel Tolkowsky pioneered the diamond sparkle in 1919, when he created the 57-facet diamond – (58 facets has become the standard for round brilliant diamonds, the most popular shape today). Passion8 Diamonds contain exactly 58 facets cut to precise mathematical proportions to achieve the most intense possible sparkle. Facets are the flat surfaces on a diamond, which capture light and create the paths through which light travels within the gemstone. Think of them as little mirrors that reflect the light from all directions, sending them straight back into our field of vision. 

Tolkowsky strategically arranged these facets so that white light would enter the diamond, reflect back and forth between the angles of the diamond cuts, and stream out of the top of the stone. The result? The brilliant shimmer we know and love today.

Of course, for this strategy to effectively create sparkle, diamond cutters need to ensure the angles of these cuts are equally proportioned to around 45 degrees. If the angles are too shallow, for example, the light will pass through the diamond and out of the bottom. If they’re too steep, the light will escape from the side of the diamond.

Passion8 Diamonds stand out from generic diamonds because of their precision cut, which showcases 8 perfect hearts and 8 perfect arrows.

The three types of sparkle

Let’s explore the three different measures, or types, of diamond sparkle: brilliance, fire and scintillation. 

1. Brilliance – white, bright and ‘wow’

Brilliance showcases how well a diamond reflects white light. When a diamond appears to have white light shining out through its surface, this is considered ‘brilliance’. Brilliance occurs when the light enters through the top of the stone, strikes one lower facet, followed by another, and then reflects back out from the top of the stone.

2. Fire – colourful, intense and scattered

Fire highlights how effectively a diamond showcases coloured light. If you’ve ever noticed brightly coloured strands radiating from a diamond’s surface, what you’re seeing is ‘fire’. Fire materialises when light hits the diamond at an angle, becomes bent, and then separates out into rainbow rays. This process is called dispersion.

3. Scintillation – flash, contrast and shine

Scintillation describes the way in which a diamond reflects light with movement. Notice the dramatic ‘flashing’ effect of light that occurs when you shift a diamond with your hand – this is scintillation. Scintillation is the result of flickering facets, caused by light entering the diamond at different angles.

Scintillation can also refer to the configuration or contrast of bright and dark spots on a moving diamond.

Dark objects in a diamond’s surroundings will also impact the stone’s shine. These reflect onto the diamond’s surface, making some facets appear dark, and therefore diminishing some sparkle.

Love sparkle? Polish makes perfect.

Polishing a diamond will further amplify sparkle by increasing the diamond’s capability to absorb, bend and reflect light. The more polished and translucent the diamond is, the greater the sparkle.

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