Cut - The Most Important Factor

Cut - The Most Important Factor

What Is Diamond Cut Grade

Diamond cut grade is one of the most important factors in a diamond’s beauty. It affects how light enters the stone, reflects within it, and returns to the eye as brilliance, fire, and sparkle.

While many people focus first on carat or clarity, cut often has the greatest visual impact. A well-cut diamond can appear brighter and more lively, while a poorly cut diamond may look dull even with strong grades in other areas.

For round brilliant diamonds, cut is evaluated through proportions, symmetry, and polish. Together, these determine how effectively a diamond handles light and how beautiful it appears in everyday wear.

Proportions The relative measurements of the diamond, including depth, table size, crown angle, and pavilion depth.
Symmetry The precision with which the diamond’s facets align and balance light return across the stone.
Polish The smoothness of the diamond’s surface, which can influence how clearly light moves through it.
Light Performance Brilliance, fire, and scintillation all depend on how effectively the diamond returns light.
Diamond cut anatomy diagram

Diamond Cut Chart

Shallow cut diamond diagram

Shallow Proportions

When a diamond is too shallow, light can leak out through the bottom or sides, reducing sparkle and brilliance.

Ideal cut diamond diagram

Ideal Proportions

An ideal cut returns light upward through the top of the diamond, creating maximum brilliance, fire, and life.

Deep cut diamond diagram

Deep Proportions

When a diamond is cut too deep, light escapes in ways that can make the stone appear darker and less lively.

Cut Characteristics

Diamond table diagram

Table

The table is the large flat facet at the top of the diamond. Its size influences light entry and overall visual balance.

Diamond crown diagram

Crown

The crown sits above the girdle and helps shape a diamond’s fire by influencing how light disperses into spectral color.

Diamond girdle diagram

Girdle

The girdle is the outer edge separating the crown from the pavilion. Its thickness affects durability and overall proportions.

Diamond pavilion diagram

Pavilion

The pavilion is the lower portion of the diamond. Its angle and depth are critical to how light reflects back through the stone.

Diamond culet diagram

Culet

The culet is the very bottom tip or tiny facet of the diamond. It affects the diamond’s finish and can influence how the point appears when viewed closely.

Diamond depth diagram

Depth

Depth is the total height of the diamond from table to culet. It plays a major role in determining whether light is returned properly or lost through the stone.

 

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