Diamond depth refers to the measurement of a diamond’s height, from the culet (bottom tip) to the table (top flat facet), as a percentage of its diameter. This is an important aspect of a diamond’s proportions and affects its overall appearance, including brilliance and sparkle.
The depth percentage is calculated as:
Depth Percentage=(Average Diameter Depth)×100
Ideal Depth Range:
The ideal depth percentage typically ranges from 59% to 62.5% for round brilliant diamonds. A diamond within this range is generally well-proportioned, optimizing light reflection and sparkle.
Impact on the Diamond:
Too Deep: If the diamond’s depth is too high (above 62.5%), it may appear smaller than its carat weight suggests because more of the diamond is concentrated in the pavilion (bottom). It can also lead to a loss of brilliance, as light may escape from the bottom of the diamond.
Too Shallow: If the depth is too shallow (below 59%), the diamond can appear larger but may not reflect light as effectively. This can cause it to appear dull or lackluster, as light may escape through the sides.
The depth, along with other factors like the diamond’s table size, crown angle, and pavilion angle, plays a critical role in determining the diamond’s overall sparkle and visual appeal.