Is a IGI report an appraisal?

No. A IGI report grades and identifies a stone — color, clarity, cut, weight, and any treatments — but it does not state a dollar value. For an insurance or resale figure you still need a separate appraisal that prices the stone against the current market.

International Gemological Institute covers diamond, colored stone, lab-grown diamond, jewelry. Each report documents the stone's measured properties so two parties can describe the same item in the same language.

How do I check a IGI report is real?

Enter the report number into IGI's official online verification at https://www.igi.org/ and confirm every detail matches the printed certificate. Check that any laser inscription on the diamond's girdle matches the report number, and be wary of photocopied or altered documents.

* Gemological lab

International Gemological Institute: reports, scope, and how to verify a certificate

World's largest gemological laboratory by volume. Strong presence in the lab-grown diamond market — the leading grading source for lab-grown stones globally.

Published May 30, 2026

Quick facts

Full name: International Gemological Institute
Headquarters: Antwerp
Country: Belgium
Founded: 1975
Status: Active
Scope: diamond, colored stone, lab-grown diamond, jewelry

What they're known for

World's largest gemological laboratory by volume. Strong presence in the lab-grown diamond market — the leading grading source for lab-grown stones globally.

Report types

IGI Diamond Report
IGI Colored Stone Report
IGI Laboratory Grown Diamond Report

Each of these describes and grades a stone — its measured properties, quality, and any detected treatments. Note that a grading report is not an appraisal: most labs document what the stone is, not what it is worth in dollars.

How to verify a report

To confirm a IGI report is genuine, check the report number against IGI's official online verification and make sure every detail on the printed document matches the database record. If the stone carries a laser inscription on its girdle, confirm it reads the same report number under magnification. Be wary of photocopied, scanned, or altered certificates — always trust the lab's own lookup over a piece of paper.

Sources

Wikidata Q6047044

* Frequently asked

FAQ

Q. Is a IGI report an appraisal?: A. No. A IGI report grades and identifies a stone — color, clarity, cut, weight, and any treatments — but it does not state a dollar value. For an insurance or resale figure you still need a separate appraisal that prices the stone against the current market.
Q. What does IGI grade?: A. International Gemological Institute covers diamond, colored stone, lab-grown diamond, jewelry. Each report documents the stone's measured properties so two parties can describe the same item in the same language.
Q. How do I check a IGI report is real?: A. Enter the report number into IGI's official online verification at https://www.igi.org/ and confirm every detail matches the printed certificate. Check that any laser inscription on the diamond's girdle matches the report number, and be wary of photocopied or altered documents.

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