---
title: "Turned girdle: meaning in gemology"
description: "A turned girdle is a girdle with a smooth round edge, shaped as a cylinder, instead of flat girdle facets. CAD often gives a round stone this kind of girdle."
url: https://digitalgemology.com/learn/glossary/turned-girdle
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Glossary](https://digitalgemology.com/learn/glossary) · Cutting and files

# Turned girdle

Also called round girdle, cylindrical girdle

A turned girdle is a girdle with a smooth round edge, shaped as a cylinder, instead of flat girdle facets. CAD often gives a round stone this kind of girdle.

## In more detail

A turned girdle is one surface in a solid but many facets on a faceting machine. So a cut page can give two facet counts.

## How we measure it

Our tools read a STEP cylinder as a ring of flat facets with the same cross-section area.

## Related terms

- [Facet count](https://digitalgemology.com/learn/glossary/facet-count): The facet count is the number of facets on a cut. On our cut pages, it is the number of planar faces of the cut's STEP solid.
- [STEP file](https://digitalgemology.com/learn/glossary/step-file): STEP is a standard CAD format that stores an exact solid, with each facet as a true plane. CAD programs such as FreeCAD, Rhino and Fusion open it to measure a stone and design a setting.
- [Girdle](https://digitalgemology.com/learn/glossary/girdle): The girdle is the narrow band at the widest part of a cut stone, between the crown and the pavilion. It is the edge that a setting grips.

## Learn more

- [The 3D models](https://digitalgemology.com/about/how-we-measure/3d-models)
- [Your own file](https://digitalgemology.com/about/how-we-measure/your-own-file)

[All 328 terms](https://digitalgemology.com/learn/glossary)