The cut of a diamond is a crucial element in determining its fire and brilliance.

The term "cut" not only refers to the diamond's shape but also how well it has been fashioned from its rough state.

A well-executed cut allows the diamond to reflect light perfectly, enhancing its luminosity and vibrancy. The quality of the cut, encompassing symmetry, proportion, and polish, directly influences the diamond's sparkle. Diamonds cut with expertise command the highest prices due to their superior brilliance and scintillation. Cut grades vary from Excellent to Poor, with precise cutting essential to reveal the diamond's true beauty.

How Diamond Cuts are Graded:

The cut grade of a diamond is determined by analyzing its symmetry and polish quality in careful proportions, such as depth, table percentage, crown angle, and pavilion depth. The Gemological Institute of America (GIA), as the ultimate authority, grades the cut of round diamonds into five categories: Excellent, Very Good, Good, Fair, and Poor.


  • Proportions refer to the angles and dimensions of a diamond. Proper proportions enable optimal light reflection, enhancing the diamond's brilliance and fire. Poor proportions can make a diamond appear lifeless and dark due to light leakage from the sides or bottom.


  • Symmetry relates to the alignment of facets and their uniformity across the diamond's surface, aiding in effective light reflection. Well-aligned facets, resembling mirror images, contribute to a diamond's visual appeal and light performance.


  • The polish grade reflects the smoothness of a diamond's facets. Higher polish grades mean smoother surfaces that reflect light more efficiently. Polishing marks can negatively affect a diamond's brilliance and its polish grade.

The Three Xs: Cut, Symmetry, and Polish

  • Cut is crucial as it most influences a diamond's beauty, pertaining to the proportions and angles that facilitate light reflection, enhancing brilliance and fire.
  • Symmetry ensures even light refraction within the diamond, contributing to its sparkle. Even slight asymmetries can influence light performance, often imperceptible to the naked eye.
  • Polish quality affects how cleanly and brightly light reflects from the diamond's surface, with excellent polish enhancing its light performance and visual appeal.

Importance of the 3Xs:

  • The combination of cut, symmetry, and polish significantly affects a diamond's cut grade, crucial for maximizing its aesthetic appeal. Diamonds with Excellent to Very Good cut grades display heightened brilliance and beauty.
  • Regardless of a diamond's high scores in carat, color, and clarity, a poor cut can substantially diminish its overall appearance and value.
  • Focusing on the Three Xs ensures the selected diamond possesses the desired sparkle and beauty, with high grades in cut, symmetry, and polish indicating exceptional light performance, making them preferred choices for engagement rings and fine jewelry.


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