Is a Gübelin report an appraisal?

No. A Gübelin 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.

What does Gübelin grade?

Gübelin Gem Lab covers colored stone identification, origin determination, treatment detection. 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 Gübelin report is real?

Enter the report number into Gübelin's official online verification at https://www.gubelingemlab.com/ 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

Gübelin Gem Lab: reports, scope, and how to verify a certificate

Among the most prestigious labs for colored stones. Gübelin origin reports on Kashmir sapphires, Burmese rubies, and Colombian emeralds command premium auction prices.

Published May 30, 2026

Quick facts

Full name: Gübelin Gem Lab
Headquarters: Lucerne
Country: Switzerland
Founded: 1923
Status: Active
Scope: colored stone identification, origin determination, treatment detection

What they're known for

Among the most prestigious labs for colored stones. Gübelin origin reports on Kashmir sapphires, Burmese rubies, and Colombian emeralds command premium auction prices.

Report types

Gübelin Gem 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 Gübelin report is genuine, check the report number against Gübelin'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 Q1554927

* Frequently asked

FAQ

Q. Is a Gübelin report an appraisal?: A. No. A Gübelin 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 Gübelin grade?: A. Gübelin Gem Lab covers colored stone identification, origin determination, treatment detection. 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 Gübelin report is real?: A. Enter the report number into Gübelin's official online verification at https://www.gubelingemlab.com/ 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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