Emerald Cut Geometry -
Parameters, Assumptions and Naming Conventions
Emerald Cut Shape
There are two parameters which determine the overall shape.
1) Length-to-Width Ratio
2) Corner Ratio Percentage
Emerald Cut Crown
Emerald cuts have crowns containing 3 tiers of facets.
The Emerald cut crown is defined by 1 assumption and 4 parameters.
1) In a bird’s eye view, the widths of all three crown tiers or step facets are equal.
1) Table diameter percentage
2) Crown angle 1
3) Crown angle 2
4) Crown angle 3
Emerald Cut Girdle
The girdle is defined by 1 parameter:
1) Girdle thickness percentage = girdle thickness divided by stone width.