---
title: "Measurements: meaning in gemology"
description: "Measurements is the report line that gives a stone's size in millimeters. A round reads minimum – maximum diameter × depth, and a fancy shape length × width…"
url: https://digitalgemology.com/learn/glossary/measurements
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Glossary](https://digitalgemology.com/learn/glossary) · Grading report

# Measurements

Also called dimensions, mm measurements

Measurements is the report line that gives a stone's size in millimeters. A round reads minimum – maximum diameter × depth, and a fancy shape length × width × depth.

## In more detail

One cut in one material has only one size at a given weight, so weight and measurements check each other. In our simulator, a 1.00 ct T73 is 6.48 mm across in diamond and 6.67 mm in moissanite. Divide the depth by the average diameter to get the total depth percentage. A big gap between the two diameters shows a round that is out of round.

## On a grading report

In the identity block of every GIA and IGI diamond report.

## Related terms

- [Average diameter](https://digitalgemology.com/learn/glossary/average-diameter): The average diameter of a round is the mean of its minimum and maximum diameters, measured across the girdle.
- [Total depth](https://digitalgemology.com/learn/glossary/total-depth): Total depth is the height of a stone from table to culet as a percentage of its average diameter. It equals crown height + girdle thickness + pavilion depth.
- [Carat weight](https://digitalgemology.com/learn/glossary/carat-weight): Carat weight is the weight of a gemstone. One carat is 200 milligrams, a fifth of a gram, and it has 100 points.
- [Length-to-width ratio](https://digitalgemology.com/learn/glossary/length-to-width-ratio): The length-to-width ratio of a fancy shape is its length divided by its width, both taken from the measurements.
- [Moissanite](https://digitalgemology.com/learn/glossary/moissanite): Moissanite is silicon carbide, one silicon atom for every carbon atom, in a hexagonal crystal. It is a diamond simulant, and every moissanite in jewelry is laboratory-grown.

## Learn more

- [The ID section of a diamond report: number, shape and measurements](https://digitalgemology.com/learn/grading-reports/diamond-report-identity-section)
- [Diamond measurements explained: diameter, depth and percentages](https://digitalgemology.com/learn/diamond-anatomy/diamond-measurements-explained)
- [Moissanite vs diamond: same size, different carat weight](https://digitalgemology.com/learn/diamond-vs-moissanite/moissanite-vs-diamond-carat-size)

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