The girdle is the narrow outer edge where the crown and pavilion of a gemstone meet. Its thickness affects security, proportions, setting fit, and visible size.

Why the girdle matters

The girdle provides the edge that prongs or a bezel secure. It also protects the stone's perimeter from direct impact.

Very thin girdles

An excessively thin edge can be more vulnerable to chipping during setting or wear, especially on exposed corners and pointed shapes.

Very thick girdles

An overly thick girdle can add hidden depth and weight without increasing face-up spread. It may also require a deeper basket or make the stone sit higher.

What balanced thickness looks like

A practical girdle is substantial enough for secure setting but not so heavy that it reduces visible size or disrupts proportions. Consistency around the perimeter also matters.

Shape-specific considerations

• Pear and marquise points need protective setting design even with a suitable girdle.
• Princess and radiant corners should not be unusually thin.
• Step cuts benefit from clean, even outlines and balanced depth.
• Bezel settings require a girdle that works with a refined but secure metal rim.

Girdle inscriptions

When applicable, a laser inscription may be placed on the girdle. It should be discreet and generally requires magnification to read.

Girdle thickness should be considered together with total depth, face-up dimensions, corner protection, and the intended setting.