Laboratory-grown diamond traceability: why the IGI certificate number is essential
When you buy a lab-grown diamond, you're trusting what you're told. The IGI certificate number is what transforms that trust into verifiable certainty. It's a detail that seems technical—but it changes everything.
What a certificate number really is
Each IGI certified diamond receives a unique, nine-digit report number, assigned at the time of gemological analysis. This number is the permanent link between the stone and its official record.
It is not generated by the seller. It is not modifiable. It is issued by the IGI—an independent body with no commercial interest in the transaction between you and the brand selling you the jewelry.
Laser inscription: the physical link between the stone and the certificate
The report number is not just on paper. It is laser-inscribed on the girdle of the diamond—the thin band separating the crown from the pavilion.
This inscription is microscopic, invisible to the naked eye, readable only with a 10x magnifying loupe. It is permanent and cannot be erased without destroying the stone. It creates an indissociable physical link between the lab-grown diamond and its certificate.
Concretely, this means it is impossible to substitute one diamond for another in an IGI certified piece of jewelry without the fraud being immediately detectable. The number inscribed on the stone must exactly match the number on the certificate—and the information displayed on the official IGI website.
How to verify in thirty seconds
Go to igi.org, section Verify a Report. Enter the nine-digit number on your certificate. In a few seconds, you'll access the official file for your lab-grown diamond: its exact weight, color, clarity, cut quality, and confirmation of its lab origin.
If the number yields no result, or if the displayed characteristics do not match the certificate you received, it's an immediate red flag.
What the number tells you about the stone
Beyond authenticity verification, the IGI report associated with the number contains precise information:
The exact proportions of the cut—crown height, girdle thickness, pavilion angle. These proportions determine the actual quality of the brilliance, regardless of the mentioned Cut grade.
The symmetry and polish grade—two criteria that refine the overall Cut grade and directly impact how light behaves in the stone.
The explicit mention laboratory grown—confirming that you are indeed buying a lab-grown diamond and not a natural diamond.
For fancy colored diamonds, the report also specifies the exact hue and the coloring method used.
Why some sellers avoid this level of transparency
A seller who does not provide an IGI or GIA certificate for a lab-grown diamond over 0.3 carats deprives themselves of this level of verifiability. Sometimes out of negligence. Sometimes for a less avowable reason.
A properly certified lab-grown diamond has nothing to hide. Its characteristics are verifiable by anyone, at any time, from anywhere in the world. It is precisely this level of transparency that we wanted at Diamelys—because that's what you deserve when making such an important purchase.
The Diamelys approach
Every lab-grown diamond we offer is IGI certified, with the report number laser-inscribed on the stone. The certificate is provided with your jewelry. The number is verifiable online even before you receive your order if you wish—we will provide it upon request.
Frequently Asked Questions
Is the IGI certificate number unique to each diamond?
Yes, absolutely. Each IGI report number is assigned only once, to a single stone, after analysis by IGI gemologists. No two diamonds have the same number.
Can an IGI certificate be falsified?
The paper certificate can theoretically be copied—which is why online verification is essential. However, the laser inscription on the stone cannot be falsified without destroying the diamond. This is the dual security system that IGI has implemented.
Is the certificate number on the ring itself?
No, it is inscribed on the girdle of the lab-grown diamond, not on the setting. To read it, you must unmount the stone or use a 10x magnifying loupe positioned on the side of the set stone.
At Diamelys, can we get the IGI number before receiving the jewelry?
Yes. Upon request, we will provide you with the report number of your lab-grown diamond before shipment, so you can verify the characteristics of your stone as soon as your order is confirmed.
A question about your lab-grown diamond certificate? Our team will answer you →
