---
title: "Star length: meaning in gemology"
description: "Star length is how far the star facets reach from the table edge toward the girdle. It is a percentage of that distance."
url: https://digitalgemology.com/learn/glossary/star-length
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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

# Star length

Star length is how far the star facets reach from the table edge toward the girdle. It is a percentage of that distance.

## In more detail

GIA's Excellent range is 45 to 65% and its Very Good range 40 to 70%. On their own, star and lower half lengths can never take a stone below Good. The T73's stars are at 50%.

## On a grading report

On the proportion diagram; GIA reports it to the nearest 5%.

## Related terms

- [Star facet](https://digitalgemology.com/learn/glossary/star-facet): Star facets are the 8 small triangular facets of a round brilliant's crown that touch the table.
- [Lower half length](https://digitalgemology.com/learn/glossary/lower-half-length): Lower half length is how far the lower half facets reach from the girdle toward the culet. It is a percentage of that distance.
- [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.
- [Cut grade](https://digitalgemology.com/learn/glossary/cut-grade): The cut grade rates how well a diamond's proportions and finish work, from Excellent to Poor. GIA gives it only to standard round brilliants in the D-to-Z color range.

## Learn more

- [Star length and lower half length in a round brilliant](https://digitalgemology.com/learn/diamond-anatomy/star-length-and-lower-half-length)
- [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)