* Gemological lab
GRS Gemresearch Swisslab AG: reports, scope, and how to verify a certificate
Specializes in colored stones, particularly ruby and sapphire. Introduced descriptive trade terms like 'pigeon's blood' and 'royal blue' that are now widely cited.
Published May 30, 2026
Quick facts
- Full name
- GRS Gemresearch Swisslab AG
- Headquarters
- Lucerne
- Country
- Switzerland
- Founded
- 1996
- Status
- Active
- Scope
- colored stone identification, origin determination
What they're known for
Specializes in colored stones, particularly ruby and sapphire. Introduced descriptive trade terms like 'pigeon's blood' and 'royal blue' that are now widely cited.
Report types
- GRS Gemstone 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 GRS report is genuine, check the report number against GRS'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.
* Frequently asked
FAQ
- Q. Is a GRS report an appraisal?
- A. No. A GRS 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 GRS grade?
- A. GRS Gemresearch Swisslab AG covers colored stone identification, origin determination. 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 GRS report is real?
- A. Enter the report number into GRS's official online verification at https://www.gemresearch.ch/ 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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