Total Depth Percentage is calculated as which measurement?

Prepare for the Gemological Institute of America's Graduate Diamonds Exam. Enhance your expertise with comprehensive quizzes and insightful explanations. Be ready to excel!

Multiple Choice

Total Depth Percentage is calculated as which measurement?

Explanation:
Total Depth Percentage shows how deep the diamond is relative to its width. It uses the total depth, measured from the table to the culet, and expresses that depth as a percentage of the average girdle diameter. This is exactly what the described option conveys: the total depth (table-to-culet depth) expressed as a percentage of the average girdle diameter. The other ratios—girdle diameter to table size, culet size to crown height, or crown height to girdle diameter—do not represent depth percentage; they describe different proportions of the stone.

Total Depth Percentage shows how deep the diamond is relative to its width. It uses the total depth, measured from the table to the culet, and expresses that depth as a percentage of the average girdle diameter. This is exactly what the described option conveys: the total depth (table-to-culet depth) expressed as a percentage of the average girdle diameter. The other ratios—girdle diameter to table size, culet size to crown height, or crown height to girdle diameter—do not represent depth percentage; they describe different proportions of the stone.

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