Lab-Grown vs Natural Diamonds: Are They Real?

Yes. A lab-grown diamond is a real diamond — chemically, physically, and optically identical to one mined from the earth. Both are pure carbon arranged in the same cubic crystal lattice. Both register 10 on the Mohs hardness scale. Both refract light with the same brilliance and fire.

The US Federal Trade Commission formally updated its jewelry guidelines in 2018 to recognise lab-grown diamonds as diamonds, removing the word "natural" from the FTC's definition. The only requirement is disclosure of origin — a lab-grown stone must be sold as "lab-grown," "laboratory-created," or "synthetic," never simply as a "diamond" without qualifier.

A gemologist using a standard 10× loupe or microscope cannot tell the two apart. Differentiation requires advanced spectroscopy at a certified gemological lab — equipment a typical jeweler does not own. What you see, wear, and pass down looks and behaves identically.

Two methods produce gem-quality lab-grown diamonds. Both replicate the conditions that form natural diamonds deep in the earth, compressed into 6–10 weeks instead of billions of years.

CVD (Chemical Vapour Deposition) starts with a thin diamond seed placed in a sealed chamber. Carbon-rich gases — usually methane and hydrogen — are heated to around 800°C, ionised into plasma, and the carbon atoms settle layer by layer onto the seed. Over weeks the crystal grows in a controlled, vertical column. CVD produces the cleanest stones and dominates the high-end lab-grown market.

HPHT (High-Pressure High-Temperature) mimics earth pressure directly. A small diamond seed sits inside a metal solvent and a carbon source. The chamber is pressed to roughly 1.5 million pounds per square inch and heated past 1,400°C. Carbon dissolves into the solvent and crystallises onto the seed. HPHT is the older method, still used widely for industrial-grade and increasingly for gem-grade stones.

Both methods yield a single diamond crystal, not a coating or a composite. The rough stone is then cut and polished by the same craftsmen who cut mined diamonds, using the same tools.

For an equivalent stone — same carat, colour, clarity, cut — lab-grown costs 40–60% less than mined. The gap widens at larger sizes. A 2ct lab-grown D-colour VVS2 stone costs roughly $3,000–$5,000 at retail. The mined equivalent runs $18,000–$28,000. A 3ct comparison: $5,000–$8,000 lab versus $40,000–$60,000+ mined.

The price difference is not a quality gap. It is a supply chain gap. Mined diamonds carry the cost of exploration, extraction, transport through DeBeers' historical channel, and decades of marketing that engineered the perception of scarcity. Lab-grown diamonds skip all of that. The seed, the chamber, the electricity, the cutter — that is the full cost stack.

At Sula, this is the entire point. A 2ct D VVS2 lab-grown stone in an 18K rose gold solitaire setting comes in around the same total spend as a 1ct mined diamond in the same setting. Same finished ring, twice the stone.

Sula's position: We specialise in 2ct+ lab-grown diamonds because we believe you should wear the stone you wanted, not a compromise priced by the mining premium.

Yes — for the same reason a natural diamond lasts. Both are 10 on the Mohs scale, the hardest naturally-occurring material. Both resist scratching from every substance except another diamond. Both can chip if struck along a cleavage plane, regardless of origin. There is no clouding, no fading, no degradation over time. A lab-grown diamond worn daily for fifty years looks the same in year fifty as in year one.

Lab-grown diamonds are not the same as moissanite, white sapphire, or cubic zirconia. Those are different minerals with different chemistry and lower hardness — they cloud, scratch, and lose fire over time. A lab-grown diamond is the same material as a mined diamond and behaves the same way over decades.

No, not by sight. Not under loupe magnification, not under microscope, not under standard jewelry-store testing tools. The two stones reflect light, sparkle, and grade identically.

The only reliable way to distinguish a lab-grown from a mined diamond is laboratory spectroscopy. Gem labs like IGI and GIA use specialised instruments — DiamondView, photoluminescence, FTIR — to detect the trace growth-pattern markers that reveal origin. This is why every Sula stone ships with an IGI report that includes growth origin clearly stated. You can prove what you have.

Lab-grown diamonds eliminate the supply-chain concerns that haunt the mined diamond industry. There is no conflict-zone provenance to trace, no artisanal mining labour to audit, no Kimberley Process to rely on. Origin is the lab and it is documented.

Environmental impact is materially lower. Mining a single carat of natural diamond disturbs about 100 square feet of land and consumes 130 gallons of water. Lab production uses neither. Energy use varies by facility — CVD plants powered by renewables run cleaner than HPHT plants powered by coal — so the honest answer is that lab-grown is lower-impact when the grower has clean energy, and significantly lower when the comparison is mining.

None of this makes a lab-grown diamond "perfect" environmentally. It makes it the lower-impact option for buyers who care.

Yes. The same labs that grade mined diamonds grade lab-grown diamonds: the International Gemological Institute (IGI), the Gemological Institute of America (GIA), HRD Antwerp, and others. They use the same 4Cs framework — carat, colour, clarity, cut — and the same grading scales.

IGI is the more common report for lab-grown stones because IGI moved earlier into the category. Every Sula diamond ships with its IGI report, which states carat, colour grade (D–F), clarity grade (VVS2 or better as standard), cut grade (Excellent), measurements, and growth origin. The report is what your insurer needs and what holds up if you ever sell or appraise.

A diamond without certification, regardless of origin, should not be treated as a finished gem. Always ask for the lab report.

For most US buyers in 2025–2026, yes — and the market shift reflects this. Over half of all US engagement rings now feature lab-grown centre stones, the first time in history this has been true. The reasons cluster: the same look at half the cost, certified origin, no supply-chain ambiguity, and budget freed to spend on a larger stone, a better setting, or a real honeymoon.

The honest trade-off is resale. A mined diamond holds more of its value if you intend to resell — though most engagement rings are not resold, they are kept or passed down. A lab-grown stone bought today at $4,000 will not retail for $4,000 in twenty years; neither will the mined equivalent, but the mined depreciation is shallower. If long-horizon resale is the goal, mined still wins on that one axis. For everything else — daily wear, sentimental value, look, durability, certification — lab-grown is equal or better at materially lower cost.

Every Sula engagement ring is built around a lab-grown centre stone: D–F colour, VVS2 or better clarity, IGI certified, set in 18K gold or platinum with a 1.8mm band. That is the standard, not the upgrade.