The emerald cut is a classic variation of the step cut, characterized by facets that are all parallel or perpendicular to the gemstone's square or rectangular girdle. It features a relatively shallow crown and pavilion, with a culet that terminates in a line rather than a point.
Typically possessing between 62 and 70 facets, the emerald cut features beveled corners and facets on both the crown and pavilion that run parallel to the girdle. This step-cut style creates a unique mirror-like reflection effect, producing parallel "hall-of-mirrors" patterns; it is highly prized for its elongated lines and striking reflective qualities. The large table and deep pavilion serve to enhance the richness of the gemstone's color.
Due to its unique design-which results in a large table-the emerald cut maximizes the visibility of the gemstone's inherent color and internal characteristics, thereby demanding high standards for clarity and color quality. For optimal visual appeal, a length-to-width ratio of 1.30–1.40 (or 1.3:1 to 1.55:1) and a depth percentage of 60%–65% are recommended.
The emerald cut design is grounded in principles of optics, crystallography, and mathematics. It requires exacting precision in its outline, careful attention to the size of the corner facets, and strict parallelism among lines and facets.
