---
title: "Fish-eye: meaning in gemology"
description: "A fish-eye is a dull ring that shows under the table of a round diamond. It is a reflection of the girdle, seen when the pavilion is too shallow."
url: https://digitalgemology.com/learn/glossary/fish-eye
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Glossary](https://digitalgemology.com/learn/glossary) · Cuts and shapes

# Fish-eye

Also called fisheye, fish-eye effect

A fish-eye is a dull ring that shows under the table of a round diamond. It is a reflection of the girdle, seen when the pavilion is too shallow.

## In more detail

A large table makes it worse, and it shows more as the stone tilts. GIA counts a fish-eye against the pattern in its cut grade. IGI's round cut chart caps the grade at Fair when a fish-eye is present.

## On a grading report

Not a line of its own. On an IGI round, a fish-eye limits the cut grade to Fair.

## Related terms

- [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.
- [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.
- [Windowing](https://digitalgemology.com/learn/glossary/windowing): A window is a face-up area through which you can see straight through a stone. It forms where pavilion facets are too shallow to reflect light, so light passes out of the back.

## Learn more

- [The grades on a diamond report: color, clarity and cut](https://digitalgemology.com/learn/grading-reports/diamond-report-grades)

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