How does symmetry affect a diamond?

Good symmetry ensures light reflects uniformly for maximum sparkle and a clean hearts-and-arrows pattern. Poor symmetry can misdirect light and create dull or uneven areas.

What symmetry grade should I choose?

Choose Excellent or Very Good symmetry, especially for round brilliants. The difference between the top two grades is not visible to the naked eye.

What is the difference between symmetry and polish?

Symmetry is the precision of facet placement and alignment; polish is the smoothness of the surface. Both are finishing factors graded by GIA from Excellent to Poor.

What is Diamond Symmetry?

Quick Answer

What is diamond symmetry?

Symmetry measures how precisely a diamond's facets are aligned and shaped, graded by GIA from Excellent to Poor. Good symmetry reflects light evenly for maximum sparkle, while poor symmetry can misdirect light. Choose Excellent or Very Good symmetry, especially for round brilliant diamonds.

Reviewed by Winnie GIA-certified Gemologist Updated Jul 15, 2026

WHAT IS DIAMOND SYMMETRY ?

In round diamond, the tip of main pavilion facets should be accurately aligned with the main facets. For examples: we can see the facets of a diamond their crown and pavilion should be asymmetry.

ASYMMETRIC OF CROWN AND PAVILION

In round diamond, pavilion organized by the Department of the top should be accurately aligned with the main facets (the sail). FIG examples: we can see the facets of a diamond crown and pavilion asymmetry.

EXTRA FACETS

These additional facets are usually located in the pavilion, close to the waist, but they can find anywhere in the diamond. FIG examples: This position is the most commonly found on additional facets.

OFF CENTER CULET

To check whether the bottom tip in the center position, you can see inside the diamond from the table, you will see the pavilion facets. If they cross the center form a perfect square, the bottom tip is in the center position. If the cross is a deviation from the party, and that is not set in. FIG examples: deviation from the center of the bottom tip they may be so.