Check IGI Report: How to Verify a Diamond Certificate
By SGJ · · 5 min read
Every claim in a diamond listing is marketing except one. The certificate is the only sentence a third party has to stand behind — and you can check IGI report numbers against the lab's own database, free, in under a minute. Most buyers never do.
That is the whole pitch for this guide. Below: where the lookup lives, what has to match between the report and the stone in front of you, how the same check works for GIA and HRD paper, and what to do when something doesn't line up.
How do you check IGI report numbers?
Three steps, no account, no fee.
- Find the report number. It is printed on the certificate, and on many stones it is also laser-inscribed on the girdle — the thin edge between the top and bottom of the diamond. A jeweller's loupe reads it; any seller with nothing to hide will put the stone under magnification for you.
- Open IGI's report verification tool and enter the number.
- Compare. The database returns the record IGI holds for that number — shape, carat weight, colour, clarity, cut, and whether the stone is lab grown or mined. That record has to agree with the paper in your hand and with the stone in front of you.
The tools exist because being checkable is the labs' entire product. Use them the way they are meant to be used: before the money moves, not after.
You do not need the stone in hand to run the check. A photo of the certificate — or just the number typed into a WhatsApp message — is enough to pull the lab's record. Run it before you visit, not at the counter with someone watching you type.
What should match between the report and the stone?
Everything the report measures. In practice, check these five:
- Carat weight, to the second decimal.
- Shape and measurements — a round of the stated millimetre spread, not roughly that.
- Colour and clarity grades, exactly as printed.
- Cut grade, where the report carries one.
- Origin — lab grown or natural, stated in writing.
Then the physical tie-breaker: if the girdle is inscribed, the inscription must match the report number. The stone is the original document; the paper is a copy. When a seller swaps a certificate between stones — the classic trick — the girdle is what gives it away.
One note for finished jewellery: a grading report covers one stone. A pair of earrings should come with two report numbers, or with a jewellery report covering the finished piece. Both are legitimate — but run an IGI certificate check on whichever you are actually holding, and know which one it is before you compare prices against another quote.
What does an IGI certified diamond report tell you?
What the stone is. Not what it is worth.
An IGI certified diamond comes with a graded record of the four Cs — carat, colour, clarity, cut — plus measurements and origin. That is the part of a listing you can verify from home, which is why our position is blunt: certification is the only verifiable claim in any listing. Everything else a seller says about a stone is marketing. It is also why every stone we sell carries IGI, GIA or HRD paper, on pieces that start at ₹14,500.
Know what the report does not tell you. It does not grade the mounting, the finishing, or whether a pair of stones match each other. It does not say whether the price is fair — a genuine certificate travels with overpriced stones every day. The report answers "is this stone what the seller says it is." The rest of the homework is comparing quotes on the same spec, which the report makes possible.
How does GIA report verification work?
Same idea, different database. GIA report verification runs through GIA Report Check: enter the report number, get the lab's record, compare it to the paper and the stone. HRD Antwerp publishes the same kind of lookup for its reports.
Different labs dominate different corners of the trade — most lab grown jewellery sold in India carries IGI paper, while GIA is the older name in mined stones. A seller offering one lab rather than another is choosing a lab, not hiding something. A seller offering no lab at all is the thing to notice.
That is the full answer to how to check if a diamond certificate is real, whichever lab graded it: go around the seller, straight to the lab that issued it. A printout can be edited. The lab's database cannot — not by the seller, anyway.
If a certificate comes from a lab you have never heard of and cannot look up, treat it as decoration. The three names above are the ones with public databases and reputations priced into every stone they grade.
What if the report doesn't check out?
Walk. Not negotiate — walk.
A number the database cannot find, grades that disagree with the paper, or an inscription that doesn't match the certificate: any one of these ends the conversation. A mismatch is not a discount opportunity, because the thing you would be negotiating for is a stone you now know nothing about.
Two honest exceptions. A reissued report or a retyped listing can put one digit wrong — a seller who immediately produces the correct number has made a typo. And a seller who will not hand over the number at all has told you something more useful than any grade: get the report number before you get attached, the same way you would check the price mechanics before falling for a stone.
Ask us for the number first
Every stone we sell is certified by IGI, GIA or HRD, and we would rather you check than trust — it takes a minute and it is the reason the certificates exist. Message us on WhatsApp with the piece you are considering and we will send the spec with the report number, honest numbers first — tell us what you are looking for. The rest of our guides live on the guides index.