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Adjusting for Shape

Only the Original Radiant Cut correctly accounts for the varying length and width of the rectangular shape to maximize the beauty of each diamond.

In general, a well-made diamond of any shape must have the correct overall depth relative to the size of the diamond or surface area. This measurement is referred to as the "depth percentage." The depth percentage must also be properly distributed between the crown (top) and pavilion (bottom) of the diamond. These measurements are referred to as "crown height" and "pavilion depth."

With round diamonds, the surface area is determined by the diameter of the circle. This makes sense, since all circles with the same diameter have the same surface area. Gem labs such as the GIA apply the same technique to rectangular diamonds by substituting the width of the rectangle for the diameter of a circle.

This system of measuring rectangular shapes creates problems because rectangles with the same width can have different surface areas due to differences in length. This means two rectangular diamonds may need very different depths to maximize the beauty of each diamond. Recognizing this issue, the Original Radiant Cut is measured to account for the differences in length and width. This gives every one of our diamonds the correct depth percentage for its overall dimensions, instilling each with incomparable radiance.

To clarify this issue, consider the following example:

Diamond A:
Measures 5 millimeters in width by 7 millimeters in length.

Diamond B:
Also measures 5 millimeters in width, but only 5 millimeters in length.

Surface Areas:
Diamond A has a 35-square millimeter surface area, and should weigh over 1.00 carat.

Diamond B has a 25-square millimeter surface area, and should weigh about .60 carat.

The Issue:
Given the 10-square millimeter difference in the surface area, these two diamonds would need very different depths to optimize the beauty of each one. By focusing only on width, traditional depth percentages do not account for this difference.

The Solution:
The Original Radiant Cut measurements consider both length and width. We adjust our measurements of depth percentage, crown height, and pavilion depth to account for both the length and width of the diamond. This way, we ensure that the diamond is properly proportioned with respect to all of its dimensions.