Diamond symmetry and diamond prices

We will talk about the overall symmetry of a diamond and its importance in the appearance but also the diamond’s price.

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How does diamond symmetry affect a stone's beauty and value?

Diamond symmetry - the precise arrangement and placement of facets - plays a crucial role in determining both a diamond's appearance and price. Working alongside polish, symmetry contributes to a diamond's final cut grade using a five-tier scale from Excellent to Poor, as established by GIA. An Excellent grade indicates virtually flawless symmetry even under 10x magnification, while Poor grade shows visible imperfections to the naked eye.

Symmetry issues can be either facet-related (such as missing or extra facets) or proportion-related (like uneven angles or off-center features). Proportion-related problems typically have a more significant impact on a diamond's value. When evaluating a diamond's symmetry, certified gemologists use specialized equipment and strict grading criteria to ensure accuracy.

For buyers seeking high-quality diamonds, understanding symmetry helps make informed investment decisions while ensuring maximum brilliance and beauty in their chosen stone.

The Symmetry of diamonds

In a diamond, symmetry and polish go together when evaluating the final cut grade of a diamond.

Symmetry is crucial for a diamonds appearance, it refers to the exact arrangement and the perfect placement of the facets on the diamond.

It can be subdivided into two types of features: the facet related and the proportion related features.

Based on the GIA grading system, there are 5 symmetry categories. These are usually defined by using either a 10x magnification loupe or a microscope using the dark field illumination to facilitate the viewing of the features.

The 5 categories are Excellent, Very Good, Good, Fair, Poor. The Excellent grade is obtained when there are no symmetry issues or they are so minute that they can hardly be seen face-up when using a 10x magnification loupe. Poor on the other hand is the lowest grade and obviously your diamond isn’t going to look harmonious and even with the naked eye. It includes for example, distortions of the facets, out-of-round outline, off-centered culet or table.

If the symmetry problem is facet related, that means that the diamond may present the following features, and depending on the number, size and how visible these features are, they can clearly modify the overall cut grade.

You can have an extra or a missing facet, there can be a natural that may cause an out of round girdle outline, there can be misalignment or a non octagonal table for instance.

The features that affect the cut grade and overall appearance of the diamond that are related to proportion can be stronger and can dramatically change the diamond’s price.

The features can include for example angle variations at the crown or pavilion, variations of the girdle thickness or it can look wavy, the cult or the table can be off centre or not parallel to one another. All of these features can really lower the cut grade of a diamond.

BAUNAT is proud to offer diamonds and jewellery certified by reputed labs. The selection offered is unbeatable in terms of diamond prices and the range of designs proposed can be elegant, refined, classic or original.

BAUNAT has the expertise and knowledge to help you with any query you may have, you can contact them by phone, email, chat or make an appointment in one of their showrooms.