What Are Lab-Grown Diamonds?
Lab-grown diamonds are real diamonds, full stop. They are pure crystallized carbon with the exact same chemical composition (C), crystal structure (cubic), hardness (10 on the Mohs scale), refractive index (2.42), and optical properties as diamonds formed deep in the earth over billions of years.
The only difference is origin. Instead of being mined from the earth, lab-grown diamonds are created in controlled laboratory environments using advanced technology that replicates the natural diamond growth process in weeks rather than millennia.
Lab-grown diamonds are not simulants. They are not cubic zirconia, moissanite, or crystal. They are diamonds in every measurable way. The Federal Trade Commission (FTC) recognizes them as diamonds, and leading gemological laboratories (IGI, GIA) grade them using the same standards as mined stones.
How Lab-Grown Diamonds Are Made
There are two primary methods for creating lab-grown diamonds, each producing stones that are indistinguishable from mined diamonds:
Method 1
HPHT: High Pressure High Temperature
Replicates the conditions found 100+ miles beneath the earth's surface. A small diamond seed is placed in a chamber with carbon material and subjected to extreme pressure (over 1.5 million PSI) and temperature (over 2,700°F). The carbon dissolves and crystallizes around the seed, growing a diamond over several weeks. HPHT diamonds tend to have excellent color and clarity.
Method 2
CVD: Chemical Vapor Deposition
A thin diamond seed is placed in a sealed chamber filled with carbon-rich gas (typically methane). The gas is heated to around 1,500°F, breaking the carbon bonds. Carbon atoms rain down onto the seed, building up the diamond layer by layer. CVD diamonds can be grown at lower pressures and offer precise control over the growth process.
Both methods produce gem-quality diamonds suitable for fine jewelry. The resulting stones go through the same cutting, polishing, and grading processes as mined diamonds. At Gabriella Amoura, we source diamonds grown using both methods, selecting for the best combination of quality and value.
Lab-Grown vs. Mined: Side by Side
| Property | Lab-Grown | Mined |
|---|---|---|
| Chemical composition | Pure carbon (C) | Pure carbon (C) |
| Crystal structure | Cubic | Cubic |
| Hardness (Mohs) | 10 | 10 |
| Refractive index | 2.42 | 2.42 |
| Brilliance & fire | Identical | Identical |
| Certification | IGI / GIA graded | IGI / GIA graded |
| Price | Usually much lower | Higher |
| Formation time | 2–6 weeks | 1–3 billion years |
| Origin | Grown in a lab | Mined from the earth |
The bottom line: every measurable property is identical. The difference is how the stone got to your finger, and how much you paid for it.
The 4Cs for Lab-Grown Diamonds
Lab-grown diamonds are graded using the same 4C system developed for mined diamonds. Here's what each means and what to look for:
Cut
The most important C. Cut determines how well a diamond reflects light: its brilliance, fire, and scintillation. Look for Excellent or Ideal cut grades. A well-cut diamond will outperform a larger, poorly cut stone every time.
Color
Graded D (colorless) to Z (light yellow). For most people, diamonds in the G–I range look colorless to the naked eye and offer the best value. Lab-grown diamonds are available across the full color spectrum.
Clarity
Measures internal inclusions and surface blemishes. VS1–VS2 grades are "eye-clean": inclusions exist but are invisible without magnification. This is the sweet spot for value without compromise.
Carat
Measures weight, not size. A well-cut 0.9ct diamond can look larger than a poorly cut 1.0ct stone. With lab-grown pricing, you can typically go a full carat higher than you could with mined, without breaking budget.
Pricing & Value
Lab-grown diamonds usually cost much less than comparable mined diamonds. That isn't because they're inferior: they're chemically identical. They cost less to produce, and the gap depends on the stone, so we don't quote a blanket percentage.
Our Math shows each of our pieces next to a typical mined-diamond price for the same carat weight and metal. See Our Math
We sell online, so there is no showroom rent in the price.
IGI Certification
The International Gemological Institute (IGI) is one of the world's leading independent gemological laboratories. Our lab-grown diamonds come from an IGI-certified catalog, and an IGI grading report details:
- Carat weight (to the hundredth)
- Color grade (D–Z scale)
- Clarity grade (FL to I3)
- Cut grade (Excellent to Poor)
- Growth method (HPHT or CVD)
- Unique report number for verification
A center stone you choose in our ring builder comes with its own report, so you can check it by its report number.
Grown, Not Mined
A lab-grown diamond starts as a small diamond seed and grows in a lab. It is never mined from the earth, so the stone is not part of the mined-diamond supply chain.
Growing a diamond still takes energy, and how much varies from lab to lab. So we keep to what we can show you: the stone is lab-grown, it is real diamond, and it comes with an IGI report you can check.
Common Myths, Debunked
"Lab-grown diamonds aren't real diamonds."
They are. Same atoms, same crystal structure, same hardness, same brilliance. The FTC defines them as diamonds. Gemological labs grade them identically.
"You can tell the difference."
Not without specialized spectroscopic lab equipment. Even experienced jewelers cannot distinguish lab-grown from mined by eye or loupe. That's because there is no visual difference.
"Lab-grown diamonds will lose all their value."
Mined diamonds also depreciate after purchase. Neither is an investment vehicle. The advantage of lab-grown is you pay less upfront for the same physical product.
"Lab-grown diamonds are just cheap knockoffs."
They're made of the same material and graded to the same standards. They cost less because the supply chain is more efficient, not because the product is inferior.
"They don't last as long."
Lab-grown diamonds are exactly as durable as mined diamonds: 10 on the Mohs hardness scale. They don't fade, cloud, or degrade over time. Your great-grandchildren will inherit the same brilliance.
How to Buy Smart
Here's what we recommend when shopping for lab-grown diamond jewelry:
Prioritize cut over carat: A well-cut 0.9ct diamond will outshine a poorly cut 1.2ct stone. Cut is what makes a diamond sparkle.
Go for G-I color: These grades look colorless to the naked eye and save significantly over D-F grades. The difference is invisible in a setting.
VS1-VS2 clarity is the sweet spot: Inclusions are invisible without magnification. Going higher than VS1 pays for differences only a lab can see.
Always get certified: Insist on IGI or GIA certification. It's your proof of quality and your protection as a buyer.
Compare total price, not just carat: A beautiful 1ct lab-grown diamond in a 14K gold setting at $2,500 delivers more value than a mediocre 0.5ct mined stone at $3,000.
Buy from transparent brands: If a retailer won't tell you where the diamond was grown, what the markup is, or provide certification, walk away.
Frequently Asked Questions
Can a jeweler tell if my diamond is lab-grown?
Not by standard examination. Only specialized spectroscopic equipment can detect the growth method. Your lab-grown diamond will test positive on a standard diamond tester.
Are lab-grown diamonds graded the same way as mined diamonds?
Yes. IGI and GIA use identical grading criteria for lab-grown and mined diamonds: the same 4C standards, the same scale, the same rigor.
What size lab-grown diamond can I get for my budget?
As a rough guide: $1,000–1,500 gets you a quality 0.75–1ct stone. $2,000–3,000 gets 1.5–2ct. A comparable mined diamond typically costs more. See Our Math for a current side-by-side on each piece.
Should I choose HPHT or CVD?
Both produce excellent diamonds. Focus on the grading report (cut, color, clarity) rather than the growth method. The end result is what matters, not the process.