Do Lab Grown Diamonds Pass a Diamond Tester? Here's the Truth
If you're considering buying a lab grown diamond in India, one question has probably crossed your mind, "Will it actually pass a diamond tester?" It's a fair concern. After all, nobody wants to spend their hard-earned money on something that doesn't hold up under scrutiny.
Let's settle this once and for all.
The Short Answer: Yes, They Absolutely Do
Lab grown diamonds pass standard diamond testers with flying colours. And the reason is surprisingly simple, they are real diamonds.
A lab grown diamond isn't a fake, an imitation, or a lookalike. It is made of pure crystallised carbon, the exact same material that makes up a mined diamond. The only difference? One was formed deep underground over billions of years, and the other was created in a controlled laboratory environment using advanced technology like CVD (Chemical Vapour Deposition) or HPHT (High Pressure High Temperature).
Since the chemical composition, crystal structure, and physical properties are identical, a diamond tester has no reason to reject a lab grown diamond. To the tester, it's simply… a diamond.
How Does a Diamond Tester Actually Work?
Understanding why lab grown diamonds pass the test becomes easier once you know what a diamond tester measures.
There are two main types:
Thermal conductivity testers, These are the most common. Diamonds are exceptional conductors of heat. When the tester's probe touches a stone, it measures how quickly heat moves through it. Both lab grown and mined diamonds conduct heat at the same rate, so both register as real.
Electrical conductivity testers, Some advanced testers also check electrical conductivity. This feature was originally added to distinguish diamonds from moissanite, since moissanite conducts electricity while diamonds generally don't. Lab grown diamonds behave the same way as natural ones here too.
In both cases, a lab grown diamond performs identically to a mined diamond on the tester.
Can a Diamond Tester Tell If a Diamond Is Lab Grown or Mined?
No, and this is an important distinction. A standard diamond tester only confirms whether a stone is a diamond or not. It cannot determine the origin.
To tell a lab grown diamond apart from a mined one, gemological laboratories use highly specialised equipment like the De Beers DiamondView, which analyses fluorescence patterns and growth structures under UV light. Natural diamonds typically show straight growth patterns, while lab grown diamonds may display curved patterns or phosphorescence.
But this kind of equipment costs lakhs of rupees and is only available in professional labs. For everyday purposes, your lab grown diamond is indistinguishable from a mined one.
What About False Negatives? Can a Lab Diamond Fail the Test?
In rare situations, yes, but it's not because the diamond is "less real." Here's what can cause a hiccup:
- Older or poorly calibrated testers may give inconsistent readings regardless of whether the diamond is natural or lab grown.
- Some HPHT diamonds contain trace amounts of boron, which can occasionally confuse electrical conductivity testers.
- Metal interference from heavy jewellery settings can sometimes affect the reading.
- Nitrogen-based testers, About 98% of mined diamonds contain nitrogen, while certain lab grown diamonds don't. A tester that checks nitrogen levels might flag a lab diamond, but this doesn't mean it's not real.
These situations are uncommon, and a certified gemologist can always verify the stone. This is exactly why reputable brands provide proper certification with every piece.
Why Certification Matters More Than a Tester
A diamond tester is a useful tool, but it's not the final word. What truly guarantees authenticity is third-party certification from recognised gemological institutions.
When you buy lab grown diamond jewellery from a trusted brand, each piece should come with a grading report from labs like IGI (International Gemological Institute) or SGL (Surat Gem Lab), evaluating the diamond on the 4Cs, Cut, Clarity, Colour, and Carat weight.
This is where a brand like AYAANI stands out. Every piece of AYAANI's lab grown diamond jewellery comes with BIS hallmarked gold and SGL or IGI certified diamonds. You're not just relying on a tester's beep, you have documented proof of quality, grading, and authenticity.
Lab Grown vs. Mined Diamonds: A Quick Comparison
| Feature | Lab Grown Diamond | Mined Diamond |
|---|---|---|
| Chemical Composition | Pure Carbon | Pure Carbon |
| Hardness (Mohs Scale) | 10 | 10 |
| Passes Diamond Tester? | Yes | Yes |
| Certified? | Yes (IGI, SGL) | Yes (GIA, IGI) |
| Environmental Impact | Minimal | Significant |
| Price | 60–80% lower | Higher |
| Ethical Concerns | Conflict-free | Varies |
As you can see, the only real differences are in price, environmental impact, and ethics, all of which favour lab grown diamonds.
Why Indian Consumers Are Choosing Lab Grown Diamonds
India's diamond market is evolving rapidly. Millennials and Gen Z buyers, especially in cities like Mumbai, Delhi, Bangalore, Surat, and Hyderabad, are increasingly drawn to lab grown diamonds for several reasons:
- Affordability: You can get a larger, better-quality diamond for a fraction of the cost. The savings can go towards a more elaborate setting, a bigger stone, or simply towards other life goals.
- Sustainability: Lab grown diamonds require no mining, which means no land displacement, no heavy water usage, and a significantly smaller carbon footprint.
- Transparency: With proper certification, you know exactly what you're getting. No ambiguity about sourcing or conflict origins.
- Modern Values: For today's conscious consumer, wearing a beautiful diamond that aligns with their values feels right.
Where to Buy Trusted Lab Grown Diamond Jewellery in India
If you're now convinced that lab grown diamonds are the real deal (because they are), the next step is choosing a brand you can trust.
AYAANI is one of India's leading lab grown diamond jewellery brands. What makes AYAANI worth considering:
- Certified diamonds: Every stone is graded by IGI or SGL, so you have complete confidence in what you're buying.
- Handcrafted designs: From minimalist daily-wear pieces to statement jewellery for special occasions, AYAANI's collection caters to every style and personality.
- Wide rangs: Rings, earrings, necklaces, bracelets, and pendants in 9K, 14K, and 18K gold options (rose, yellow, and white gold).
- Lifetime exchange and buyback:, A policy that reflects the brand's confidence in its own product.
- Accessible luxury: AYAANI's mission is to make diamond jewellery accessible to every Indian household without compromising on quality or elegance.
Whether you're shopping for an engagement ring, a birthday gift, or a treat for yourself, AYAANI offers the kind of jewellery that doesn't just look stunning, it feels right knowing it's ethical and sustainable.
Final Thoughts
The question "Do lab grown diamonds pass a diamond tester?" has a clear and definitive answer, yes, they do, because they are real diamonds in every meaningful sense.
If you're in India and looking for beautiful, certified, and ethically created diamond jewellery, brands like AYAANI Diamonds are making it easier than ever to own the sparkle you deserve, without the guilt, without the inflated price tag, and without any compromise on quality.
Your diamond should reflect who you are. And in 2026, choosing lab grown is choosing smart, sustainable, and stunning.
FAQs
Are lab grown diamonds fake?
No. Lab grown diamonds are chemically, physically, and optically identical to mined diamonds. They are real diamonds, just created in a lab instead of underground.
Will your jeweller be able to tell it's lab grown?
Not with the naked eye or a standard diamond tester. Only specialised laboratory equipment can identify the origin of a diamond.
Do lab grown diamonds lose their sparkle over time?
Absolutely not. They have the same hardness (10 on the Mohs scale) and durability as mined diamonds. They will sparkle just as brilliantly decades from now.
Are lab grown diamonds cheaper because they're lower quality?
No. They're more affordable because the production process is more efficient than mining. The quality, brilliance, and fire are identical to mined diamonds of the same grade.
Does AYAANI provide certification with their jewellery?
Yes. All AYAANI lab grown diamond jewellery comes with BIS hallmarked gold and diamonds certified by SGL or IGI.