IGI and GIA are both respected independent gemological laboratories, and both grade lab-grown diamonds on the 4Cs. IGI grades the majority of the world's lab-grown diamonds; GIA is long trusted for its rigour. For a lab-grown diamond, what matters most is not the name on the report but that the report matches the stone.
What is the difference between IGI and GIA?
Both are independent laboratories that grade diamonds against the 4Cs and laser inscribe a report number on the stone. The difference is mostly one of scope and history. GIA was established first and built its name on natural diamonds. IGI came later and became the laboratory that grades most of the world's lab-grown diamonds. Here is how they compare for a lab-grown stone.
| IGI | GIA | |
|---|---|---|
| Full name | International Gemological Institute | Gemological Institute of America |
| Established | 1975 | 1931 |
| Lab-grown diamonds | Grades the majority of the world's lab-grown diamonds | Grades lab-grown diamonds |
| Grades on | The 4Cs | The 4Cs |
| Report number | Laser inscribed on the stone | Laser inscribed on the stone |
| Available in India | Widely | Widely |
Is IGI as good as GIA for lab-grown diamonds?
For a lab-grown diamond, yes. IGI grades more lab-grown diamonds than any other laboratory and has deep experience with them, which is why most lab-grown stones you see, in India and abroad, carry an IGI report. GIA is equally rigorous. Neither laboratory makes a diamond better or worse. A certificate does not change the stone. It records it. So the honest question is not IGI or GIA. It is whether the report in front of you truly belongs to the diamond in front of you.
What to look for, whichever laboratory grades it
The name on the report matters far less than these four checks. They hold true for an IGI report and a GIA report alike.
- The number must match the stone. Ask to see the report number laser inscribed on the diamond, and match it to the certificate. This single step is what a certificate is for.
- You receive the stone that was graded. The diamond you are shown should be the one described on the report, not a similar one.
- An ideal cut. Cut decides how much light a diamond returns. Look for the top cut grade, whichever laboratory graded it.
- Colour and clarity you can name. Ask exactly where the stone sits on the scale, not just its carat weight.
How Nivara certifies every diamond
Every Nivara diamond is IGI-certified, with its report number laser inscribed on the stone so the paper and the diamond are one. We go a step further. Every diamond also ships with a light performance report that grades its brightness, its fire, and its contrast, the things the 4Cs do not measure. And every Nivara diamond is held to a single standard: VVS clarity, E colour, ideal cut, hearts and arrows precise, chosen by our gemologists and passed through 27 quality checks before it is set. To understand what all of this is worth, read our guide to lab-grown diamond prices in India, or start with what an IGI certificate tells you.
Frequently asked questions about IGI and GIA
Which is better, IGI or GIA?
Neither is better. Both are respected independent laboratories that grade diamonds on the 4Cs and laser inscribe the report number on the stone. IGI grades the majority of the world's lab-grown diamonds; GIA is long trusted for natural ones. What matters is that the report matches the stone you receive.
What does an IGI certificate tell you?
An IGI certificate documents a diamond's 4Cs: carat weight, cut grade, colour grade, and clarity grade, along with measurements, polish, and symmetry. For a lab-grown diamond it also states the growth method. The report number is laser inscribed on the stone, so the certificate and the diamond are one.
Are IGI-certified lab grown diamonds real?
Yes. A lab-grown diamond is a real diamond, with the same carbon structure, hardness, and brilliance as a mined one, which is why IGI grades it on the same 4Cs scale. The report states the stone's origin, nothing less. Every Nivara diamond is IGI-certified, with its number laser inscribed on the stone.
Is a lab grown diamond a real diamond?
Yes. A lab-grown diamond is chemically, physically, and optically identical to a mined diamond. It is grown from a diamond seed rather than pulled from the earth, and it grades on the same 4Cs. Whether an IGI or a GIA report accompanies it, a real diamond is what it certifies.
Choose the diamond, not the letters on the label. When the number on the report matches the number on the stone, you are holding proof you can trust. Explore our lab-grown diamond solitaires, or book a private viewing at a Nivara showroom in Hyderabad, Bangalore, or Indore, and match the two yourself.
