Depth percentage

Depth percentage refers to the ratio of a diamond’s depth compared to its diameter, crucial for assessing its brilliance and fire.

Part of speech: noun
Definition: In the domain of gemology, particularly when assessing diamonds, 'depth percentage' denotes a critical measurement that compares the depth (from the table to the culet) of a diamond to its average diameter (measured across the girdle). This parameter is pivotal in evaluating a diamond's overall appearance, including its brilliance and fire. A well-proportioned diamond, as determined by its depth percentage, can better reflect and refract light, leading to more sparkle and visual appeal. Conversely, diamonds with either too high or too low depth percentages might not capture and reflect light as effectively, resulting in less brilliance and perceived value. The ideal depth percentage varies by diamond shape but is essential for indicating the quality of cut and overall aesthetics of the stone.