How to Verify an IGI Certificate Number
Registry Guide • Published July 15, 2026
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Entering the grading report code directly into the lab registry confirms authenticity details.
To verify an IGI certificate number, enter the number into the official IGI “Verify Report” service and open the corresponding digital grading report.
You must then compare that digital record with the report supplied by the retailer, the product-page specifications, the physical diamond, and the laser inscription on the diamond’s girdle.
Finding a valid report number online is only the first step. A copied number can correspond to a genuine report while being used to advertise a different diamond. Complete verification means confirming that the online report, supplied document, and actual diamond all match.
Quick Answer
1. Understanding the IGI Report Number
An IGI report number is the unique identification code assigned to a graded stone. It links the physical diamond to the laboratory's digital archives. The code can be located at the top of printed copies, beside verification QR codes, or engraved microscopically on the diamond's girdle.
If a retailer offers a certified centre diamond but refuses to share the certificate number before your order, treat this as a warning sign and pause the transaction.
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Unique registry codes identify loose or set stones in the laboratory database.
2. Step-by-Step Verification Instructions
Follow these essential steps to run online registry checks safely:
- Request Complete Reports: Never accept cropped screens or summaries. Request full copies showing date logs, comment footnotes, and measurements.
- Visit Official Portals: Input the URL yourself rather than clicking links in advertisements or emails to prevent landing on phishing pages.
- Input Codes Exactly: Avoid confusing letters and numbers (e.g. zero '0' with letter 'O', one '1' with letter 'I').
.jpg "Verify Online Registry Entries")
Ensure that online description parameters align exactly with the physical diamond.
Registry Fields to Match
| Detail | What must match |
|---|---|
| Report number | Exact number supplied by the retailer |
| Description | Laboratory-grown diamond |
| Report date | Same date shown on the supplied report |
| Shape | Round, oval, emerald, pear or other advertised shape |
| Cutting style | The cutting description shown on the report |
| Measurements | Same millimetre dimensions |
| Carat weight | Exact weight of the graded diamond |
| Colour | Same grade as the product listing |
| Clarity | Same grade as the product listing |
| Cut | Same grade where applicable |
| Polish | Same report result |
| Symmetry | Same report result |
| Fluorescence | Same strength and colour |
| Comments | Same growth and treatment information |
| Inscription | Same inscription information |
3. Physical Checks and Document Mismatches
Girdle Laser Engravings: Laser inscriptions are microscopic codes that jewellers read using loupes or zoom lenses. Girdle settings can cover parts of codes, so double-check code positions before setting stones.
Document Alterations: Copying report numbers to mask lower-grade stones is a common tactic of fraudulent retailers. Watch for uneven fonts, cropped comment zones, missing origin labels, or blurry registry pages.
Safe QR Code Scanning: Treat QR code links carefully. Always check that scanned domains route to the official `.org` or secure registry addresses before entering details.
.jpg "Laser Inscription Microscope Assessment")
A matching laser inscription code printed on the girdle connects the diamond to its online report.
IGI Report Verification Checklist
| Before purchase, verify: |
|---|
| Obtain the complete report number and search independently. |
| Match shape, carat weight, measurements, and comments exactly. |
| Read CVD/HPHT growth method logs and treatment comments. |
| Verify that the digital certificate is not marked as replaced or expired. |
| Request high-resolution videos showing physical girdle codes under magnification. |
| Review return policies to ensure you can verify parameters post-delivery. |
Final Verdict
Frequently Asked Questions
Where can I verify an IGI certificate number?▼
Use the Verify Report service on IGI’s official website. Enter the complete report number and compare the resulting digital report with the supplied document and diamond.
Is an IGI certificate number unique?▼
IGI assigns a unique report number to each grading report. The number identifies a report, but buyers must still confirm that the report corresponds with the physical diamond.
Can I verify an IGI certificate for free?▼
IGI’s online report-verification facility allows consumers to search for the digital report using its number without purchasing a separate grading service.
Why is my IGI report number not working?▼
Possible causes include a typing error, an incomplete number, a recently issued report, a temporary website issue or a document that was not issued by IGI.
Does finding an IGI report online prove the diamond is genuine?▼
It proves that a report with that number exists. You must still compare the physical diamond’s inscription, measurements and characteristics with the report.
Where is the IGI number written on the diamond?▼
It may be laser-inscribed on the diamond’s girdle. The report should state the inscription information.
Can I see the IGI inscription with my eyes?▼
Usually not. A jeweller’s loupe or microscope is normally required to locate and read the inscription.
Can someone copy a genuine IGI certificate number?▼
Yes. A copied number could be used in a listing for a different stone. This is why measurements, grades and the physical inscription must also be checked.
What should I do if the certificate and product page show different grades?▼
Ask the retailer for the correct report and written clarification. Do not purchase a diamond advertised with better grades than its report records.
Does an IGI report number confirm the diamond’s resale value?▼
No. It identifies the grading report and documented characteristics. It does not guarantee present or future resale value.
Should the IGI number appear on my invoice?▼
For a product sold with an individually graded diamond, placing the report number on the invoice or order documentation improves traceability.
Can an IGI report be verified after the diamond is set?▼
Yes. The report number can be checked online, although inspecting the girdle inscription may be more difficult if the setting covers it.
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