No conversation in Indian fine jewellery is moving faster than the natural versus lab-grown debate. Lab-grown diamonds arrived quietly and are now a genuine market force — priced 40–60% below natural stones for identical optical and chemical properties. So which should you buy? Here's the honest answer.
What Is a Lab-Grown Diamond?
A lab-grown diamond is a real diamond — not a simulant like cubic zirconia or moissanite. It has the same crystal structure (pure carbon), the same hardness (10 on the Mohs scale), the same refractive index, and the same sparkle as a diamond mined from the earth. The only difference is origin.
They are created using one of two processes:
- HPHT (High Pressure High Temperature): Replicates the conditions deep in the earth. Typically produces more yellowish or brownish tones that require careful grading.
- CVD (Chemical Vapour Deposition): A gas process that grows diamond carbon atom by atom on a seed crystal. Produces higher-colour stones more reliably.
IGI certifies both natural and lab-grown diamonds — but they use separate report formats, and the report clearly states "Lab-Grown Diamond Report" vs. "Diamond Grading Report."
The Price Difference Is Real — and Large
As of 2025, a lab-grown diamond costs roughly 40–60% less than a comparable natural diamond of the same cut, colour, clarity, and carat weight. That means:
- A 1.00ct G/VS2/Excellent natural diamond: ~₹2,50,000–₹3,50,000
- A 1.00ct G/VS2/Excellent lab-grown diamond: ~₹1,00,000–₹1,50,000
The price gap has widened over the past two years as lab-grown production scaled. It's likely to widen further.
Where They Are Identical
- Appearance: Visually indistinguishable — even to trained gemologists with a loupe. Both require specialised equipment to separate.
- Hardness: Both are 10 Mohs — the hardest natural substance. Both are equally scratch-resistant.
- Sparkle: Identical refractive index, identical brilliance when cut to the same standards.
- IGI grading: Both are graded on the same 4C scale.
Where They Differ
Resale Value
This is the biggest real-world difference. Natural diamonds hold a resale value of roughly 30–50% of purchase price in India (jewellers typically buy back at wholesale, not retail). Lab-grown diamonds are depreciating faster as production costs continue to fall — resale value is currently very low, and may approach near-zero in the secondary market over the next decade.
Verdict: If you are buying with any expectation of resale, natural is the only logical choice.
Emotional and Cultural Perception
In India, jewellery purchases — especially for weddings and milestones — carry significant cultural weight. The natural diamond carries the narrative of rarity, geological time, and permanence. Lab-grown is increasingly accepted but has not yet reached parity in the Indian wedding jewellery context.
Verdict: For gifting or occasions where the story matters as much as the stone, natural remains the standard.
Sustainability
Lab-grown is often marketed as more sustainable — and it's partly true. No open-pit mining. But CVD and HPHT are energy-intensive processes; the sustainability argument depends heavily on the energy source powering the lab.
Ethically sourced natural diamonds (from conflict-free regions with certified supply chains) are a responsible choice too.
Who Should Buy Lab-Grown?
Lab-grown makes the most sense when:
- You want maximum size for your budget — a 1.50ct lab-grown costs what a 0.70ct natural costs.
- You are buying jewellery for daily wear where resale isn't relevant — fashion earrings, pendants, stackable rings.
- You are not concerned with holding value — treating jewellery as wear, not investment.
- You want to try fine diamond jewellery at a lower entry price before committing to natural.
Who Should Buy Natural?
Natural diamond is the better choice when:
- You are buying for a wedding, engagement, or milestone — the permanence and rarity are part of the meaning.
- You want to preserve value — natural diamonds retain resale value; lab-grown may not.
- You plan to pass it down — heirlooms are natural by definition.
- The story matters — "I bought your grandmother a diamond formed over billions of years" lands differently than "I bought one grown in a lab in three weeks."
My Carat's Position
At My Carat, we currently carry natural, IGI-certified diamonds. Our belief is that for the Indian buyer making a meaningful purchase — engagement, anniversary, milestone — natural is the right call. The emotional and resale considerations are real and matter to our customers.
We may add a curated lab-grown range in future for fashion-forward daily-wear pieces. When we do, we'll be transparent about it — every product page will clearly state natural or lab-grown, and every stone will carry an IGI certificate.
Whatever you decide, never buy uncertified. Whether natural or lab-grown, an IGI report is non-negotiable.
Browse My Carat's IGI-certified natural diamond jewellery →
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