What is crown angle?

What is crown angle?

• A. The angle between the table and girdle.
• B. The angle formed by the bezel facets and the girdle plane.
• C. The angle formed by the crown facets and the pavilion plane.
• D. The angle of the pavilion relative to the table.

Answer: (B)

Crown angle defines how steeply the crown facets, specifically the bezel facets, meet the girdle plane. The crown is the upper portion of the diamond above the girdle, and the bezel facets are the top crown facets surrounding the table. The girdle plane is the broad, horizontal reference line through the diamond’s widest point. The crown angle is the angle formed where those bezel facets rise from the girdle toward the table. This angle is important for how light travels inside the diamond—an optimal crown angle helps light reflect back to the observer, boosting brilliance and fire. Other descriptions either talk about unrelated measurements or mix different parts (like the pavilion or the table), so they don’t define crown angle.

Crown angle defines how steeply the crown facets, specifically the bezel facets, meet the girdle plane. The crown is the upper portion of the diamond above the girdle, and the bezel facets are the top crown facets surrounding the table. The girdle plane is the broad, horizontal reference line through the diamond’s widest point. The crown angle is the angle formed where those bezel facets rise from the girdle toward the table. This angle is important for how light travels inside the diamond—an optimal crown angle helps light reflect back to the observer, boosting brilliance and fire. Other descriptions either talk about unrelated measurements or mix different parts (like the pavilion or the table), so they don’t define crown angle.