When shopping for an oval-cut diamond, you might notice a shadowy effect in the center of the stone, often referred to as the "bowtie effect." This phenomenon is more noticeable in elongated oval cuts than in their balanced oval counterparts. But why is that?

What Is the Bowtie Effect?

The bowtie effect is a dark area that appears across the center of an oval diamond. This happens because of the way light interacts with the diamond's facets. Ideally, light enters and exits the diamond in a way that maximizes its sparkle. When light doesn’t reflect uniformly, it causes a shadow, creating the bowtie shape.

Why Elongated Ovals Have More Bowtie?

1. Facet Arrangement
   In an elongated oval, the facets are more stretched out along the length of the stone. This can cause light to be less evenly distributed, leading to more pronounced shadowing in the center.

2. Length-to-Width Ratio
   Elongated ovals typically have a higher length-to-width ratio compared to balanced ovals. The more stretched the shape, the more likely light reflections can create an uneven distribution, which emphasizes the bowtie effect.

3. Light Reflection
   Because of the longer shape, light doesn't travel through the diamond in a uniform way. The longer length can cause light to scatter in a way that highlights the shadow, making the bowtie more visible.

Does It Impact the Diamond’s Quality?

No, the bowtie effect doesn’t indicate poor quality. It’s a natural characteristic of oval diamonds, particularly in the elongated shape. While it may not be noticeable in every stone, some people appreciate the uniqueness it adds, while others prefer a more balanced oval without the shadow.

Minimizing the Bowtie Effect

To reduce the bowtie effect, look for an ideal cut with better symmetry, as well as a balanced length-to-width ratio. Diamonds with a ratio between 1.35 and 1.50 tend to have more even light dispersion, which can help lessen the appearance of the bowtie.

Conclusion:
While the bowtie effect is more common in elongated oval cut diamonds, it doesn't affect the diamond’s overall quality or brilliance. If the effect is something you want to avoid, consider a more balanced oval or a different shape. Understanding these factors can help you find the perfect diamond that matches both your style and preferences.