9 Lab-Grown Diamond Myths, Debunked by a Gemologist

Last updated July 2026

We hear the same handful of myths about lab-grown diamonds on repeat, some outdated, some just never true to begin with. Here they are, addressed plainly, one at a time.

Myth 1: "Lab-grown diamonds are fake"

Reality: No. A lab-grown diamond is pure crystallised carbon in the same cubic crystal structure as a mined diamond, chemically, physically and optically identical. It's not cubic zirconia, not moissanite, not a simulant of any kind. It's diamond, grown above ground rather than mined. If you want the full regulatory and definitional breakdown of what "real" actually means here, we've covered that separately in Are Lab-Grown Diamonds Real?

Myth 2: "You can tell a lab-grown diamond apart from a mined one just by looking"

Reality: You can't, and neither can most jewellers, without specialised equipment like spectroscopy. Side by side, a well-cut lab-grown diamond and a well-cut mined diamond are indistinguishable to the naked eye.

Myth 3: "Lab-grown diamonds don't sparkle the same way"

Reality: Sparkle comes from cut quality, not origin. A well-cut lab-grown diamond will outperform a poorly cut mined diamond every time, and the same is true in reverse. Origin has no bearing on brilliance, fire or scintillation.

Myth 4: "They're cheap because they're lower quality"

Reality: They're cheaper because the production process is shorter and doesn't involve mining and extraction, not because the stone is inferior. As of 2026, lab-grown diamonds typically cost around 70 to 90% less than a comparable mined diamond, a genuinely wide gap, but one driven by production economics and scarcity, not quality. We've broken this down properly in Are Lab-Grown Diamonds Lower Quality?

Myth 5: "Lab-grown diamonds aren't durable enough for daily wear"

Reality: They score 10 out of 10 on the Mohs hardness scale, identical to mined diamonds, and are entirely suitable for an engagement ring worn every day for decades. Scratch resistance is identical. Any diamond, regardless of origin, can chip under a hard enough impact on an unprotected edge, that's a property of diamond generally, not a lab-grown weakness.

Myth 6: "They're not properly certified"

Reality: Reputable lab-grown diamonds are graded by the same labs that grade mined diamonds, chiefly IGI and GIA, using the same fundamental grading criteria. One current nuance: since October 2025, GIA grades lab-grown diamonds on a simplified Premium/Standard system rather than the detailed scale it still uses for mined stones, while IGI continues full 4Cs grading. Different format, same rigour. Full detail in our certification guide.

💎 Want to see certified sparkle in a finished piece? Explore the Luna Pear Solitaire Ring, available with a certified lab-grown diamond or moissanite centre stone.

Myth 7: "They're conflict diamonds in disguise" or "They're automatically better for the planet"

Reality: Neither extreme is accurate. Lab-grown diamonds have a fully traceable, conflict-free origin, that part's genuinely true. But "automatically better for the environment" oversells it: impact depends heavily on the energy source used to grow the stone. One grown on renewable energy has a meaningfully lower footprint than mining; one grown on a coal-heavy grid may not. The US Federal Trade Commission has specifically warned against unqualified "eco-friendly" claims for lab-grown diamonds, so we'd rather be accurate than repeat a blanket claim. Ask what powered the growth of the specific stone you're considering.

Myth 8: "Lab-grown diamonds are worthless on resale"

Reality: Not worthless, but meaningfully lower than mined diamonds, and that's worth understanding honestly rather than glossing over. Lab-grown diamonds typically retain around 10 to 30% of retail price on resale, versus roughly 25 to 50% for mined diamonds, because new stones can be produced on demand rather than being finite. Neither type should really be treated as a financial investment though; we've made the case for that properly in The Truth About Resale Value.

Myth 9: "Lab-grown diamonds are just a passing trend"

Reality: They've moved well past trend status. Lab-grown diamonds now account for a substantial and growing share of engagement ring centre stones globally, driven by genuine advantages in price, traceability and consistency rather than a fad. The technology and grading infrastructure behind them, IGI, GIA, ISO-accredited labs, has matured alongside demand, not just kept pace with it.

The Honest Bottom Line

Lab-grown diamonds are real diamonds. They're not automatically better in every respect, resale is genuinely lower, and environmental impact depends on the producer, but they're not fake, not lower quality, and not a compromise dressed up as an alternative. They're a legitimate, well-established choice with real trade-offs worth understanding honestly, which is exactly what we try to do with every client.

How We Handle This at VYOR Diamond Lab

Nikolett and I would rather correct a myth than let it sit unaddressed, even the ones that don't favour lab-grown outright. If you've heard something about lab-grown diamonds and aren't sure whether it's fact or leftover marketing noise, ask us directly at a consultation, we'll give you a straight answer either way.

Frequently Asked Questions

Are lab-grown diamonds fake? No. They're chemically, physically and optically identical to mined diamonds, genuine diamond, grown above ground rather than mined.

Can jewellers tell lab-grown and mined diamonds apart by eye? No, not without specialised equipment such as spectroscopy. Visually they're indistinguishable.

Do lab-grown diamonds scratch or wear out faster? No. Hardness is identical (10 on the Mohs scale) for both, and lab-grown diamonds are entirely suitable for daily wear over decades.

Are lab-grown diamonds bad for resale value? They retain less value than mined diamonds on resale, typically 10 to 30% versus 25 to 50%, but neither should be treated as a financial investment in the first place.

Is it true that lab-grown diamonds are always better for the environment? Not automatically. It depends on the energy source used to grow the stone. Renewable-energy production has a meaningfully lower footprint than mining; coal-powered production may not.

Explore our Lab-Grown Diamond Engagement Ring Collection, or book a consultation at our Wembley showroom, myths welcome, we're happy to answer them honestly.