---
title: "Report number: meaning in gemology"
description: "The report number is the unique number a lab gives a report. GIA registers it in its database, so anyone can look it up."
url: https://digitalgemology.com/learn/glossary/report-number
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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

# Report number

Also called certificate number, GIA report number, IGI report number

The report number is the unique number a lab gives a report. GIA registers it in its database, so anyone can look it up.

## In more detail

Many stones carry their report number on the girdle, written by a laser. Compare that number, the online record and the stone's weight and measurements. A matching number alone proves little. GIA has found moissanites with a fake GIA inscription that copied a real report number.

## On a grading report

In the identity block near the top of the report. IGI inscribes every laboratory-grown stone with "LG" before its report number.

## Related terms

- [Inscription](https://digitalgemology.com/learn/glossary/inscription): An inscription is text that a laser writes on the girdle of a stone, too small to see without magnification. Most often it is the report number.
- [Report Check](https://digitalgemology.com/learn/glossary/report-check): Report Check is GIA's online database. Enter a report number to see what GIA itself recorded; IGI's equivalent is Verify Your Report.
- [Measurements](https://digitalgemology.com/learn/glossary/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.
- [Diamond grading report](https://digitalgemology.com/learn/glossary/diamond-grading-report): A diamond grading report is an independent lab's record of what a stone is and how it grades. It is true for the day the lab examined the stone.

## Learn more

- [The ID section of a diamond report: number, shape and measurements](https://digitalgemology.com/learn/grading-reports/diamond-report-identity-section)
- [Moissanite certificates vs diamond grading reports](https://digitalgemology.com/learn/diamond-vs-moissanite/moissanite-certificate-vs-diamond-report)

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