How to Use This Calculator
- Enter the diamond's width and length in millimeters. These are the two most important measurements for an emerald cut.
- Input the table size (the width of the table facet) in millimeters.
- Provide the girdle diameter (the diameter of the diamond's perimeter) in millimeters.
- Click the "Calculate" button to generate the proportions and quality assessment.
Understanding Emerald Cut Proportions
The emerald cut diamond is characterized by its rectangular shape with step-cut facets. The key proportions to evaluate are:
- Depth Percentage: The ratio of the diamond's height to its width. For emerald cuts, a typical ideal range is 60-70%.
- Table Percentage: The table size relative to the girdle diameter. A common ideal range is 60-70%.
- Crown Angle: The angle of the crown facets. This affects how light enters and exits the diamond.
What to Look For
A well-proportioned emerald cut diamond will have:
- A depth percentage between 60-70%
- A table percentage between 60-70%
- Straight, well-defined edges with minimal girdle thinning
- Subtle fire and sparkle despite its faceting pattern
Note: This calculator provides basic proportion analysis. For comprehensive diamond grading, consult a professional gemologist.