That diamond photo on your phone screen can look flawless and still turn out to be glass, moissanite, or a stone with a completely made up certificate. It happens more often than people think. Every year, buyers across India end up paying full price for something a lot less valuable, either because a seller skipped certification altogether or, worse, handed over a fake report and hoped nobody would check.
This guide covers exactly what you need to know: how to verify lab grown diamond authenticity, the warning signs that usually mean something is off, and a few simple checks you can run yourself before you pay a rupee.
5 Red flags that signal a fake or uncertified stone
A certificate is not paperwork for show. It is an independent lab's record of what a stone actually is, issued by a gemologist with no stake in the sale.
The most trusted name for LGD jewelry in India is IGI. An IGI report lists the cut, colour, clarity and carat weight, and states clearly whether the stone is lab grown or natural.
Here’s how to spot the red flags:
1. No report number, or no matching laser inscription
Every genuine lab made diamonds report carries a unique number, and that same number should be laser inscribed on the diamond's girdle, the thin edge running around the stone. If the number is missing from the invoice, or a jeweller cannot find it inscribed on the stone under 10x magnification, something does not add up.
2. The seller discourages online verification
A legitimate certificate holds up to scrutiny. A seller who avoids the topic, or claims verification is not necessary, is protecting something.
3. Price that feels too good
Lab grown diamonds already cost far less than mined ones. A price that undercuts even that benchmark by a wide margin usually means a simulant like moissanite or cubic zirconia is involved.
4. Vague or missing growth method
A real IGI report names the growth method, either CVD or HPHT. Certificates that skip this detail deserve a second look.
5. Mismatched measurements
This one matters more than people realise. Moissanite has a different density than diamond, so a moissanite cut to match a diamond's carat weight will measure differently. GIA gemologists in South Africa once caught a fraud this exact way, on a stone inscribed with a report number that belonged to a completely different diamond.
Read Now: IGI vs SGL vs GIA Certification for Lab-Grown Diamonds: Which Matters in India?
How to check a lab diamond certificate online?
Checking a lab diamond certificate check online takes under a minute, and every buyer should do it before finalising a purchase.
Step 1: Find the report number
It should be printed clearly on the certificate, usually in the top corner.
Step 2: Visit the lab's official website
Go to igi.org and look for the report verification page.
Step 3: Enter the number and compare
The website pulls up the original grading details. Match every field, cut, colour, clarity and carat, against your physical certificate.
Step 4: Ask a jeweller to check the inscription
A quick look under magnification confirms the number on the stone matches the number on the paper.
Real cases prove why this step matters. In 2021, Surat authorities investigated a trader accused of using counterfeit report numbers to pass off lower quality stones as premium diamonds.(Read more)
What does a trustworthy seller look like?
A seller with nothing to hide makes verification easy, not difficult. At Jewelbox, every lab grown diamond comes with an IGI certificate and a report number customers can check themselves before or after purchase. That transparency is the simplest test of all. Jewelbox would rather a buyer verify independently than take a claim at face value, and that is exactly how the process should work everywhere.
FAQs
1. What is the most common fake lab grown diamond India buyers encounter?
Moissanite or cubic zirconia sold without disclosure, often at prices designed to look like a bargain on a genuine lab grown stone.
2. Can I trust a certificate that has no report number?
No legitimate certificate skips this. A missing report number means there is nothing to verify, which is reason enough to walk away.
3. Does a low price always mean a fake diamond?
Not always, but it is a strong signal worth investigating. Compare the price against certified stones of the same specifications before assuming it is a good deal.
4. Where can I buy IGI certified lab grown diamonds safely?
Established LGD brands like Jewelbox provide certification upfront and support independent verification, which is the safest way to buy.
