What Are Lab-Grown Diamonds? Everything You Need to Know
Published April 19, 2026 · 9 min readLab-grown diamonds have moved from a whispered industry secret to the mainstream choice for savvy jewellery buyers. In 2026, they account for a rapidly growing share of the global diamond market, and for good reason: they are chemically, physically, and optically identical to mined diamonds — at a fraction of the cost and with none of the environmental baggage.
But questions remain. Are lab-grown diamonds real? How exactly are they made? And should you buy one? This comprehensive guide answers every question you might have.
Are Lab-Grown Diamonds Real Diamonds?
Yes, unequivocally. Lab-grown diamonds are real diamonds. They share the exact same crystal structure (pure carbon arranged in a cubic lattice), hardness (10 on the Mohs scale), refractive index, and thermal conductivity as mined diamonds. The Federal Trade Commission (FTC) recognises them as diamonds. The only difference is their origin — a laboratory instead of deep within the Earth.
Even trained gemologists cannot distinguish a lab-grown diamond from a natural one using standard tools. Specialised equipment that detects trace nitrogen patterns or growth markers is required to tell them apart. When set in a ring on your finger, they are indistinguishable.
How Are Lab-Grown Diamonds Made?
There are two primary methods used to grow diamonds in a laboratory. Both replicate the natural conditions under which diamonds form — extreme heat and pressure — but compress billions of years into a matter of weeks.
CVD (Chemical Vapour Deposition)
A thin diamond seed is placed in a sealed chamber filled with carbon-rich gas (typically methane). The chamber is heated to around 800–1,200°C, ionising the gas into plasma. Carbon atoms rain down onto the seed, bonding layer by layer to grow a rough diamond crystal.
- Growth time: 2–4 weeks for a 1-carat rough
- Strengths: Produces very high-purity Type IIa diamonds
- Common for: Colourless and near-colourless grades
HPHT (High Pressure, High Temperature)
A diamond seed is placed in a press that generates pressures of roughly 5–6 GPa and temperatures above 1,400°C, mimicking the conditions 150 km below the Earth’s surface. A carbon source (usually graphite) dissolves in a molten metal catalyst and crystallises onto the seed.
- Growth time: Several days to weeks
- Strengths: Well-established, cost-effective method
- Common for: Larger stones and fancy colours
At GemHub & Co., we source diamonds grown via both CVD and HPHT processes, selecting only stones that meet our strict quality benchmarks.
The Certification Process
Reputable lab-grown diamonds are graded by the same independent gemological laboratories that certify mined diamonds. The most recognised institutions include:
- IGI (International Gemological Institute) — the most common lab-grown diamond certifier globally
- GIA (Gemological Institute of America) — now issuing full grading reports for lab-grown stones
- GCAL (Gem Certification and Assurance Lab) — known for guaranteed grading accuracy
Each certificate details the diamond’s Four Cs — carat weight, cut grade, colour grade, and clarity grade — along with its growth method and any treatments. Every lab-grown diamond at GemHub & Co. ships with an independent certificate so you can buy with complete confidence.
Lab-Grown vs Natural Diamonds: The Key Differences
| Factor | Lab-Grown Diamond | Natural (Mined) Diamond |
|---|---|---|
| Chemical Composition | Pure carbon (C) | Pure carbon (C) |
| Hardness | 10 Mohs | 10 Mohs |
| Price (1 ct, G VS2) | $800 – $2,500 | $4,000 – $12,000 |
| Environmental Impact | Significantly lower carbon footprint | Extensive mining operations |
| Ethical Concerns | Conflict-free by nature | Kimberley Process required |
| Resale Value | Lower (still evolving) | Moderate |
| Certification | IGI, GIA, GCAL | GIA, AGS, IGI |
The Value Proposition: Why Choose Lab-Grown?
1. Save 50–70% Compared to Mined
The most immediate benefit is price. A lab-grown diamond of identical quality to a mined stone costs roughly half to a third as much. That means you can either save significantly or upgrade to a larger, higher-quality stone within the same budget.
2. Ethical and Environmental Peace of Mind
Lab-grown diamonds require no mining, which eliminates concerns about habitat destruction, water pollution, and exploitative labour practices. While energy is required to grow them, advances in renewable-powered facilities continue to shrink their environmental footprint.
3. Identical Beauty
There is no visual compromise. The sparkle, fire, and scintillation of a lab-grown diamond are identical to a mined diamond because the material is the same. Your jewellery looks just as stunning — and nobody can tell the difference.
4. Growing Acceptance
Major luxury brands, celebrity endorsements, and shifting consumer attitudes mean lab-grown diamonds carry no stigma in 2026. They are simply a smarter way to buy a real diamond.
Common Myths Debunked
"Lab-grown diamonds are fake"
False. They are real diamonds with the same atomic structure. Cubic zirconia and moissanite are different gemstones entirely. If you are interested in those alternatives, see our Moissanite vs Diamond guide.
"They cloud or degrade over time"
False. Lab-grown diamonds are just as durable and permanent as mined diamonds. They will not cloud, fade, or lose brilliance.
"You can tell the difference with the naked eye"
False. There is no visible difference. Only advanced laboratory instruments can detect the growth method.
How to Shop for Lab-Grown Diamonds
- Set your budget — then compare what size and quality you can achieve in lab-grown vs natural.
- Prioritise cut quality — cut determines sparkle more than any other C. Look for Excellent or Ideal grades.
- Choose your shape — round brilliant offers maximum sparkle; oval and cushion offer great finger coverage.
- Verify certification — always buy with an IGI or GIA certificate.
- Select your setting — browse our rings, earrings, and pendant collections for inspiration.
Who Should Buy Lab-Grown Diamonds?
Lab-grown diamonds are ideal for anyone who wants a real diamond without the inflated cost of mining and supply-chain markups. They are especially popular among couples shopping for engagement rings, buyers who prioritise sustainability, and anyone who simply wants more carat for their money.
If resale value is your primary concern and budget is no constraint, a mined diamond may still suit you. For everyone else, lab-grown is the clear winner in 2026.
Shop Certified Lab-Grown Diamonds
Every lab-grown diamond at GemHub & Co. is independently certified, conflict-free, and set in handcrafted designs. Discover brilliance without compromise.
Explore Lab-Grown Collection
