---
title: "Crown angle: meaning in gemology"
description: "The crown angle is the slope of the bezel facets, measured against the plane of the girdle."
url: https://digitalgemology.com/learn/glossary/crown-angle
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Glossary](https://digitalgemology.com/learn/glossary) · Anatomy and proportions

# Crown angle

Also called crown angle (degrees)

The crown angle is the slope of the bezel facets, measured against the plane of the girdle.

## In more detail

Tolkowsky calculated 34.5° in 1919. GIA's Excellent limit for the crown angle alone is 31.5° to 36.5°. GIA grades the crown and pavilion as a pair, so a shallower crown can balance a steeper pavilion.

## On a grading report

On the proportion diagram, in degrees; GIA reports it to the nearest 0.5°. IGI's Ideal band is 33 to 36°.

## Related terms

- [Crown height](https://digitalgemology.com/learn/glossary/crown-height): Crown height is the height of the crown, from the girdle to the table. It is a percentage of the average diameter.
- [Bezel facet](https://digitalgemology.com/learn/glossary/bezel-facet): Bezel facets are the 8 large four-sided facets on the crown of a round brilliant. They run from the table to the girdle.
- [Pavilion angle](https://digitalgemology.com/learn/glossary/pavilion-angle): The pavilion angle is the slope of the pavilion mains, measured against the plane of the girdle.
- [Table size](https://digitalgemology.com/learn/glossary/table-size): Table size is the width of the table as a percentage of the average diameter.
- [Fire](https://digitalgemology.com/learn/glossary/fire): Fire is the flashes of spectral color that a cut stone sends out. In our census, fire is the share of returned light whose colors leave more than 0.6° apart.

## Learn more

- [Crown angle and crown height in a round diamond](https://digitalgemology.com/learn/diamond-anatomy/diamond-crown-angle)
- [How to read the proportion diagram on a diamond report](https://digitalgemology.com/learn/grading-reports/diamond-proportion-diagram)
- [How to read diamond proportions: decode a stone from its numbers](https://digitalgemology.com/learn/diamond-anatomy/how-to-read-diamond-proportions)

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