How to check a GRS report

GRS report verification happens on GRS's own website: go to gemresearch.ch/report-verification, enter the report number, the report date and the weight exactly as printed — or scan the QR code on the report — and GRS shows the data it holds. If a field does not match, the system tells you which one. A match shows only that such a report exists; GRS itself says real authentication means re-inspecting the original report and the stone.

How GRS verification works

1. 1.
   Go to the official address. Type gemresearch.ch/report-verification yourself. GRS warns on that page that websites with similar designs, names or addresses may claim to be GRS. If you scan the QR code on the report, check that the page that opens is on gemresearch.ch.
2. 2.
   Enter three things exactly as printed: the report number, the report date (day, month, year) and the weight. For a pair of stones, GRS asks for the first weight only.
3. 3.
   Accept the licence agreement and press Verify Report.
4. 4.
   Read the result. A verified report shows the GRS report number, date, object description, identification, weight, colour, dimensions, cut, shape, comments and origin, with an appendix where one was issued. You can download a PDF or copy a link to the result.

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If something is off, GRS says so plainly: the report number is not found, the date does not match its records, or the weight does not match. Any of these is a reason to stop and email GRS at [email protected].

Two cautions from GRS itself. The PDF the system produces states that it is not a gemstone report and that results may vary from the original printed report. And the page warns that the online check does not protect against cyber fraud; for extra security, GRS suggests emailing a copy of your report to the lab.

The limits GRS sets out

• Five years. GRS limits its voluntary online support to five years, so an older report may not verify. Its FAQ adds that reports issued before 2000 must be sent to GRS for verification.
• Not every report is online. GRS says it does not guarantee that all issued reports are in the database; some report data does not exist digitally.
• Updates lag. The database is refreshed periodically, so a report issued very recently may not appear yet.

Signs of an altered or fake GRS report

• A mismatch on number, date or weight. The system checks all three; a forger has to get every one right.
• Missing holograms. GRS states that its gemstone reports bear two holograms with the GRS logo.
• A lookalike website. A QR code on a forged report can open a copy of the verification page. Read the address bar.
• A weight that does not fit the stone. GRS notes that stones get re-cut while old reports stay in circulation.
• An old report on an important stone. Even if genuine, it may have been recalled, updated or overtaken by new research.

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What a GRS report proves — and what it doesn't

GRS is direct about this. Of its own online database, it says: "It only indicates that such a report may exist." Its licence terms state that a report can be authenticated only by having the original report and the corresponding stone re-inspected by a GRS laboratory.

GRS recommends re-checking every stone at the time of purchase and at each change of ownership. Its reasons: a report may have been recalled or updated, the stone may have been re-cut or altered, and knowledge about origin and treatment moves on.

Reading GRS wording: its own codes

GRS is not one of the seven LMHC laboratories, and its treatment wording is its own. It uses codes rather than the minor-moderate-significant scale other labs share, so compare like with like.

For emeralds, GRS grades clarity enhancement on a six-step scale: none, insignificant, minor, minor to moderate, moderate, prominent — naming the filler when a moderate or prominent filling is resin. A note that non-enhanced clarity features are present means empty or dried-out fissures at the time of testing — fissures that could be filled later, making the stone look cleaner while its report still reads "none".

GRS also runs colour-stability testing, which matters for padparadscha-like sapphires whose orange can fade towards pink.

Before you pay

• Hold the original report and find both GRS holograms.
• Verify it yourself at gemresearch.ch/report-verification — number, date and weight — and compare every field.
• Weigh the stone and compare it with the report; a different weight means re-cutting, or a different stone.
• GRS's own advice is to re-check a stone at purchase and at each change of ownership. For a significant stone, or a report more than five years old, take that advice.
• Read the treatment code, not the seller's summary of it.

For the wider case against trusting a scan, see cross-checking a lab report.

What Everystone does about it

A free Registry record keeps a stone's details and its GRS report number in one place you can share, and once the report number is confirmed with GRS, the record says so. Matching that report to the physical stone is what an Everystone Passport adds: the report describes a stone, the passport shows it is this one. When you buy through the shop, every lot says how far it has been checked, from seller-declared to full verification, and your payment is held until you confirm the stone. More on buying safely.