Which term is defined as the table-to-culet depth expressed as a percentage of the average girdle diameter?

Which term is defined as the table-to-culet depth expressed as a percentage of the average girdle diameter?

• A. Three-point diamond
• B. Total depth percentage
• C. Trace elements
• D. Transmission

Answer: (B)

Depth expressed as a percentage of the average girdle diameter measures how deep the diamond is from the table to the culet, using the stone’s width as the reference. This specific measure is called the total depth percentage. To find it, you take the total depth (table to culet), divide by the average girdle diameter, and multiply by 100. This normalization lets you compare depths across stones of different sizes and is a key factor in assessing cut quality because depth influences how light is reflected and refracted within the diamond. The other terms point to unrelated ideas: a three-point diamond refers to a shape/mark, trace elements are impurities affecting color, and transmission describes how much light passes through.

Depth expressed as a percentage of the average girdle diameter measures how deep the diamond is from the table to the culet, using the stone’s width as the reference. This specific measure is called the total depth percentage. To find it, you take the total depth (table to culet), divide by the average girdle diameter, and multiply by 100. This normalization lets you compare depths across stones of different sizes and is a key factor in assessing cut quality because depth influences how light is reflected and refracted within the diamond. The other terms point to unrelated ideas: a three-point diamond refers to a shape/mark, trace elements are impurities affecting color, and transmission describes how much light passes through.