All Blog

A customer walked into a Mumbai jewellery shop last month, placed two identical-looking diamond rings on the counter, and asked the jeweller to identify which one cost ₹3 lakh and which cost ₹12 lakh. The jeweller examined both under his loupe, checked the clarity, tested the hardness, and after fifteen minutes of careful inspection, pointed to the wrong ring. Both were genuine diamonds—one grown in a laboratory in Surat, the other pulled from a mine in Botswana decades ago.

This isn’t a trick question or a gotcha moment. It’s the reality of lab grown diamonds in 2026.

The Science Behind Lab Grown Diamonds

Lab grown diamonds are chemically, physically, and optically identical to mined diamonds because they’re made of the same thing: pure carbon atoms arranged in a crystal lattice structure. The only difference is their birthplace—one forms 150 kilometres beneath the Earth’s surface over millions of years, while the other develops in a controlled laboratory environment over several weeks.

But here’s where it gets interesting. The technology that creates these diamonds didn’t emerge overnight. CVD (Chemical Vapor Deposition) and HPHT (High Pressure High Temperature) methods have been refined for decades, originally for industrial applications. Diamond-tipped drill bits, heat sinks for electronics, even windows for space applications—these all used lab grown diamonds long before anyone considered them for engagement rings.

The breakthrough came when scientists figured out how to grow gem-quality diamonds consistently. Not just any diamonds, but stones that could rival the finest natural specimens for clarity, colour, and size.

How HPHT Creates Diamonds

HPHT technology mimics the exact conditions found deep in the Earth’s mantle. A small diamond seed gets placed in a chamber with carbon-rich material, then subjected to pressures exceeding 50,000 atmospheres and temperatures around 1,500°C. That’s roughly the pressure you’d experience 200 kilometres underground and hot enough to melt copper instantly.

The process typically takes 2-6 weeks depending on the desired size. Most HPHT diamonds tend to have a slightly yellowish tint initially, though advanced techniques now produce colourless stones regularly. The method works particularly well for creating fancy coloured diamonds—blues, yellows, and pinks that would cost astronomical amounts in natural versions.

CVD: The Newer Method

Chemical Vapor Deposition sounds like something from a chemistry textbook, but the concept is elegant. A diamond seed sits in a sealed chamber filled with carbon-rich gas, usually methane mixed with hydrogen. When heated to about 800°C (much cooler than HPHT), the gases break down and carbon atoms settle onto the seed, building the diamond layer by layer.

CVD diamonds often show superior clarity compared to HPHT stones. The controlled environment allows for fewer inclusions and more predictable growth patterns. However, CVD diamonds sometimes require additional treatment to achieve the most desirable colours, particularly removing any greyish or brownish tints that can occur during growth.

Physical Properties: Identical Twins

Here’s what jewellers sometimes get wrong when explaining lab grown diamonds—they’re not “similar” to natural diamonds or “diamond-like.” They are diamonds in every measurable way.

Hardness? 10 on the Mohs scale, identical to mined diamonds. Refractive index? 2.42, exactly the same. Thermal conductivity? Lab grown diamonds conduct heat just as efficiently, which is why they’ll fog and clear at the same rate when you breathe on them. Electrical conductivity? Also identical, except for some blue lab diamonds that can conduct electricity due to boron content.

The Federal Trade Commission updated their jewellery guidelines in 2018 to acknowledge this reality. They removed the word “natural” from the definition of diamond because lab grown stones meet every criteria that defines a diamond. The Gemological Institute of America, probably the most respected diamond authority globally, grades lab grown diamonds using the same 4C standards—Cut, Clarity, Colour, and Carat weight.

Yet misconceptions persist. Some people believe lab diamonds are “fake” or will “turn cloudy” over time. This stems from confusion with diamond simulants like cubic zirconia or moissanite, which are entirely different materials designed to look like diamonds.

Market Reality Check

Lab grown diamonds have captured approximately 20% of the global diamond market as of early 2026, up from less than 5% just five years ago. In India specifically, that percentage runs higher—closer to 30%—partly due to the country’s position as a major diamond cutting and polishing centre.

Price differentials have stabilised somewhat after dramatic drops in previous years. Currently, lab grown diamonds cost about 60-80% less than comparable natural stones, depending on size and quality. A 1-carat, VS1 clarity, G-colour lab diamond might retail for ₹80,000-₹1,20,000 in Hyderabad, while the same specifications in a mined diamond could easily exceed ₹4,00,000.

But pricing isn’t the only factor driving adoption.

Why People Choose Lab Grown

Environmental concerns play a significant role, particularly among younger buyers. Diamond mining, even when conducted responsibly, requires moving enormous quantities of earth—roughly 250 tonnes of ore to yield one carat of diamond. Lab grown diamonds use considerably less water and produce minimal ground disturbance.

Ethical considerations matter too. While initiatives like the Kimberley Process have largely eliminated conflict diamonds from legitimate supply chains, some consumers prefer the certainty that comes with lab grown stones. There’s no question about working conditions or environmental impact when the diamond grows in a controlled facility.

Then there’s the practical angle. The price difference allows buyers to choose larger stones or higher quality grades within the same budget. A couple planning to spend ₹2 lakh on a diamond engagement ring could select a 0.75-carat natural diamond or a 1.5-carat lab grown stone of similar quality.

Identification and Certification

Professional gemologists can distinguish lab grown diamonds from natural ones, but only with specialized equipment. Standard jewellery loupes won’t reveal the difference. Advanced spectroscopy machines can detect trace elements and growth patterns that indicate synthetic origin, though even these require expert interpretation.

The Gemological Institute of America issues separate certificates for lab grown diamonds, clearly marked as “Laboratory Grown” with distinctive serial numbers. Other reputable certification bodies like IGI (International Gemological Institute) and GCAL follow similar protocols. These certificates detail the same quality factors—cut grade, clarity characteristics, colour grade, and fluorescence—using identical standards.

Some unscrupulous sellers have attempted to pass lab grown diamonds as natural stones, which is why certification remains crucial. Reputable jewellers always provide proper documentation and disclose the origin clearly. Places like eleve-diamonds that specialise in lab grown stones make this transparency a cornerstone of their business model.

Durability and Longevity

Diamond engagement rings need to last decades, which raises legitimate questions about long-term performance. Lab grown diamonds show no signs of degradation over time because they possess the same crystal structure as natural stones. They won’t chip, crack, or lose brilliance any differently than mined diamonds.

Some early lab grown diamonds from the 1990s had structural weaknesses due to primitive growing techniques, but modern production methods have eliminated these issues. Current CVD and HPHT processes produce diamonds with crystal integrity matching or exceeding many natural stones.

Insurance companies treat lab grown diamonds similarly to natural ones for coverage purposes, though replacement values reflect current market prices rather than original retail costs.

The Resale Question

Natural diamonds have traditionally held resale value better than lab grown stones, though this gap may be narrowing. Currently, lab grown diamonds retain perhaps 20-30% of their retail value in secondary markets, compared to 40-60% for natural diamonds of similar quality.

This difference reflects market maturity more than intrinsic value. As lab grown diamonds become more mainstream and production costs stabilise, resale values will probably improve. However, anyone buying diamonds purely as investment vehicles should understand that most diamonds—natural or lab grown—are consumer goods rather than appreciating assets.

Future Developments

Diamond growing technology continues advancing rapidly. New techniques under development could reduce production time from weeks to days while improving control over colour and clarity characteristics. Some experimental methods show promise for growing large, flawless diamonds that would be impossible to find naturally.

The industry expects continued price pressure on natural diamonds, particularly in smaller sizes where lab grown alternatives offer compelling value propositions. Luxury brands are adapting by emphasizing the romantic and traditional aspects of natural stones while also launching lab grown collections for price-conscious consumers.

China and India dominate current lab grown diamond production, with facilities in Singapore and the United States contributing smaller volumes. As demand grows, production capacity expansion seems inevitable, which should help stabilise pricing and availability.

So the question isn’t really whether lab grown diamonds are “real” diamonds—they definitively are. The question is whether the traditional premium for natural stones will persist as technology makes perfect diamonds accessible to everyone.

And honestly? That probably depends more on marketing than mineralogy.