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What Causes a Bowtie in Diamonds?

13 Feb 2023
Bow Tie Effect in Diamonds

Diamonds are known for their sparkling beauty, but sometimes they can have a peculiar feature, known as a "bow tie." If you've ever noticed a dark, elongated shape in the center of a diamond, that's a bow tie.

Photo on the right shows an Oval Cut diamond with a barely noticeable bow tie effect.
 

So, what causes a bow tie in a diamond? The phenomenon is caused by light being refracted, or bent, as it passes through the diamond. If the diamond is cut in a certain way, it can cause light to converge in the center of the diamond, creating the appearance of a bow tie. The size and shape of the bow tie are dependent on the cut of the diamond, as well as its proportions and symmetry.

The shape of the diamond can also play a role in causing a bow tie. A pear or marquise shaped diamond is more likely to have a bow tie because they have a smaller surface area for light to reflect off of, compared to a round diamond.

It's important to note that not all oval-shaped diamonds have a bow tie. Some are cut in a way that minimizes or eliminates the appearance of a bow tie. However, some people actually prefer the appearance of a bow tie in an oval diamond, as they believe it adds character and uniqueness to the stone.

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