How Does the Shape of Lab-Grown Marquise Diamonds Affect Their Brilliance?


Diamonds have always been synonymous with elegance, luxury, and everlasting beauty. For centuries, they have been cherished for their brilliance and sparkle, making them highly sought-after gemstones. With technological advancements, lab-grown diamonds have emerged as a popular alternative to natural diamonds. These cultivated diamonds possess the same chemical and physical properties as their natural counterparts, but one aspect that sets them apart is their shape. In this article, we will explore the impact of the marquise shape on the brilliance of lab-grown diamonds.

Exploring the Marquise Shape

The marquise shape, also known as the navette shape due to its resemblance to a small boat, is a distinctive and elongated diamond shape with pointed ends. Created in the 18th century by King Louis XV of France, it has maintained its popularity till today. The unique shape of the marquise diamond lends it an elegant and unconventional charm, making it a favorite choice for engagement rings and other fine jewelry.

Understanding Diamond Brilliance

Brilliance is one of the most important factors in determining the overall beauty and value of a diamond. Often referred to as the "sparkle" of a diamond, brilliance is the optical effect created by the dispersion and refraction of light within the diamond. When light enters the diamond, it undergoes several processes, such as reflection, refraction, and dispersion, before returning to the viewer's eyes. The quality and cut of a diamond greatly impact its ability to reflect and refract light, thus affecting its brilliance.

The Impact of Shape on Brilliance

The shape of a diamond plays a significant role in determining its brilliance. Different diamond shapes reflect light in unique ways, resulting in variations in brilliance and sparkle. The marquise shape, with its elongated form and signature pointed ends, offers a distinct visual appeal and can affect the brilliance of a lab-grown diamond in several ways.

The Advantage of Length

One of the key factors that contribute to the brilliance of a diamond is its length. In the case of marquise diamonds, the elongated shape provides a larger surface area for light to enter the stone. This increased surface area allows for more light to interact with the facets, resulting in enhanced brilliance and sparkle. The longer the marquise diamond, the more opportunities it has to reflect and refract light, creating a dazzling display of brilliance.

The Importance of Facets

Facets are the flat, polished surfaces on a diamond that act as mirrors, reflecting and refracting light. The number and placement of facets greatly influence how light interacts with a diamond. Marquise diamonds typically feature 56 facets, including a large table facet at the top and two rows of smaller facets along the curved edges. These facets are carefully cut to maximize light return and enhance brilliance. The unique arrangement of facets in a marquise diamond allows for a spectacular play of light, contributing to its overall brilliance.

Considerations for Ideal Proportions

While the marquise shape offers inherent brilliance, it is important to consider the ideal proportions for a well-cut diamond. The length-to-width ratio, or the proportion between the length and width of the stone, greatly impacts the overall appearance and brilliance of a marquise diamond. The generally accepted ideal length-to-width ratio for a marquise diamond is around 2:1, although personal preferences may vary. Diamonds with a higher length-to-width ratio tend to appear slimmer, while those with a lower ratio may appear wider. It is essential to strike a balance that suits individual preferences while maintaining the diamond's brilliance and visual appeal.

Enhancing Symmetry for Maximum Brilliance

Symmetry is another crucial aspect that affects the brilliance of a marquise diamond. Symmetry refers to the precise alignment and arrangement of facets within a diamond. A well-cut marquise diamond should exhibit excellent symmetry to ensure maximum brilliance. Symmetrical facets allow light to interact uniformly throughout the diamond, resulting in a consistent and dazzling display of brilliance. When considering a marquise diamond, it is important to examine its symmetry, ensuring that it is symmetrical both horizontally and vertically. A lack of symmetry may lead to light leakage and diminished brilliance.


The shape of a lab-grown marquise diamond undoubtedly influences its brilliance. With its elongated form and unique arrangement of facets, the marquise shape offers a captivating display of light reflection and refraction. The advantage of length, carefully crafted facets, ideal proportions, and symmetry all contribute to the overall brilliance of a lab-grown marquise diamond. Whether it adorns an engagement ring or other exquisite jewelry, a well-cut marquise diamond promises to mesmerize with its exceptional brilliance and timeless beauty. So, if you're seeking a diamond that combines elegance and brilliance, the marquise shape is certainly a delightful choice.


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