Lab-grown and natural diamonds are chemically, physically and optically the same: both are pure carbon crystals with the same hardness and sparkle, and you can't tell them apart without lab equipment. The differences are price, resale value and origin. Lab-grown diamonds cost far less for the same size and quality; natural diamonds hold more value and are rarer. Choose lab-grown for the biggest, best-looking stone for your budget, natural if rarity and long-term value matter to you.
Choosing between a lab-grown and a natural diamond is now one of the first decisions in buying an engagement ring. They look identical, but they differ in price, value and story. Here is what changes and what doesn’t.
What is the same
A lab-grown diamond is not a simulant like cubic zirconia or moissanite. It is a real diamond:
- Same material: pure carbon in a cubic crystal structure.
- Same hardness: 10 on the Mohs scale, the hardest natural material.
- Same sparkle: the same refractive index and dispersion, so the same brilliance and fire for a given cut.
- Same grading: both are graded on the 4Cs (cut, color, clarity and carat) by labs such as GIA and IGI.
Side by side, a trained gemologist can’t tell them apart without lab testing.
How lab-grown diamonds are made
Labs grow diamonds in two ways:
- HPHT (high pressure, high temperature) recreates the heat and pressure deep in the earth.
- CVD (chemical vapor deposition) builds the crystal layer by layer from a carbon-rich gas.
Both produce diamonds in weeks rather than billions of years. The method doesn’t change how the finished stone looks or wears.
Where they differ
| Lab-grown | Natural | |
|---|---|---|
| Price | Much lower for the same size and grade | Higher, driven by rarity |
| Resale value | Very little | Some, though well below retail |
| Origin | Grown in a lab in weeks | Formed over billions of years, then mined |
| Supply | Effectively unlimited | Finite |
| Grading report | Notes lab-grown origin | Notes natural origin |
Price
The price gap is the main reason people choose lab-grown. For the same carat weight, color and clarity, a lab-grown diamond typically costs a fraction of a natural one, and the gap has widened every year. In practice, buyers either save money or buy a larger, higher-grade stone for the same budget.
Value over time
Treat any diamond as something you buy to wear, not an investment. Natural diamonds resell for well below what you paid at retail, but there is an established secondhand market. Lab-grown diamonds have very little resale value because new ones keep getting cheaper.
Origin and ethics
Some buyers choose lab-grown to avoid mining altogether. Others prefer natural stones and look for traceable sourcing, such as stones mined in Canada or covered by a brand’s own origin program. Lab growing uses a lot of energy, so if environmental impact is your priority, look at how a specific grower powers its labs.
How to choose
Choose lab-grown if:
- You want the largest, whitest, cleanest stone your budget allows.
- Resale value doesn’t matter to you.
- You prefer a stone with no mining in its history.
Choose natural if:
- Rarity and the stone’s age matter to you.
- You want some long-term value, or plan to pass the ring down.
- You prefer the tradition of a mined diamond.
What to check either way
Whichever you choose, the buying checklist is the same:
- Get a grading report from a recognized lab, and check that the report number matches the laser inscription on the stone’s girdle.
- Prioritize cut. Cut has the biggest effect on sparkle. An excellent or ideal cut makes a smaller stone look brighter than a poorly cut larger one.
- Balance color and clarity. Near-colorless (G to H) and eye-clean (VS2 to SI1) stones look excellent once set, and cost much less than the top grades.
- Check the return policy and whether resizing and cleaning are included.
Common questions
Are lab-grown diamonds real diamonds?
Yes. The US Federal Trade Commission defines a diamond by what it is, not where it formed, and lab-grown diamonds have the same chemical composition, crystal structure and hardness as mined diamonds. They must be disclosed as lab-grown, laboratory-created or similar.
Can a jeweler tell a lab-grown diamond from a natural one?
Not by eye or with a loupe. Telling them apart takes specialized lab equipment that detects differences in growth patterns and trace elements. Grading labs laser-inscribe lab-grown stones and note the origin on the report.
Do lab-grown diamonds hold their value?
Generally no. Lab-grown prices have fallen steeply as production has grown, and there is little resale market for them. Natural diamonds also resell for well below retail, but hold value better.
Do lab-grown diamonds get cloudy or change color?
No. A lab-grown diamond is as stable and durable as a natural one, and it won't cloud, fade or change color over time.