What are lab-grown diamonds?
Lab-grown diamonds are real diamonds made by people rather than formed underground. They have the diamond crystal structure and essentially the same chemical, physical and optical properties as mined diamonds. They are not cubic zirconia or moissanite, which are different materials that can resemble diamond.
For jewelry, the attraction is straightforward: you can usually buy the diamond appearance and size you want for much less than a comparable mined diamond. That is what first drew us to lab-grown diamond earrings, and it remains the main reason we recommend considering them.
The origin does not make every stone equally good. A lab-grown diamond can be beautifully cut, poorly cut, visibly tinted or full of inclusions. You still need to choose the individual diamond and a jeweler you trust.
| Question | Short answer |
|---|---|
| Are they real diamonds? | Yes. Lab-grown describes the origin, not an imitation material. |
| How are they made? | Mainly by high pressure, high temperature (HPHT) or chemical vapor deposition (CVD). |
| Can you see the difference? | Appearance alone does not reliably establish origin; specialist testing can. |
| Do they last? | They have diamond's durability, although diamonds can still chip. |
| Why choose one? | Usually a lower purchase price for comparable size and appearance. |
| What is the trade-off? | They do not have natural geological origin, and you should not buy expecting to recover the retail price. |
What is the difference between mined and lab-grown diamonds?
The main difference is how the crystal formed. A mined diamond grew in the Earth; a lab-grown diamond grew in controlled equipment. Both are cut and polished into the familiar jewelry shapes.
“The same material” does not mean that every detail is identical. Growth conditions leave features that specialist laboratories can use to identify origin. Those are different from a visible label that makes a lab-grown diamond look less attractive. GIA explains the shared properties and growth differences.
This is also why we separate two questions: is it diamond, and is it natural or laboratory-grown? A basic diamond tester is not enough to answer both. Our guide to whether lab-grown diamonds are real explains the practical checks.
The four Cs still help you compare appearance and weight, but not every grading laboratory uses the same report format. Read the actual document rather than assuming that a seller's “certified” label gives you all the details.
How are mined diamonds created?
Natural diamonds form deep in the Earth, where high pressure and heat allow carbon to crystallize as diamond. Volcanic processes can later carry diamond-bearing rock toward the surface. Mining then recovers the rough crystals, which are sorted, cut and polished.
That geological history matters to some buyers. Others mainly want the look of the finished jewelry and would rather spend less. We favor lab-grown diamonds for that second buyer, but the choice is personal: a laboratory origin does not offer the same story as a natural stone.
How are lab-grown diamonds created?
The two main production methods are HPHT and CVD. Both grow a diamond crystal from a small diamond seed. The rough then needs cutting and polishing, just as mined rough does.
Growth time varies with the method, size and desired result. It is not a useful quality ranking: a claim that one diamond took longer to grow does not tell you which finished stone looks better.
High pressure, high temperature (HPHT)
HPHT uses a press to create intense pressure and heat around a carbon source, a metal solvent and a diamond seed. Carbon dissolves in the molten metal and crystallizes on the seed. The process reproduces some of the conditions involved in natural diamond formation, in a much smaller controlled space.
Chemical vapor deposition (CVD)
CVD grows diamond from gases in a chamber. A mixture that commonly includes hydrogen and methane is activated into a plasma. Carbon from the gas builds up as diamond on the seed surface. Hydrogen helps suppress unwanted non-diamond carbon growth.
Some diamonds also receive treatment after growth to improve their color. That does not turn them into an imitation. Read the laboratory's origin and treatment comments along with the appearance grades. GIA's research describes both growth processes and post-growth treatment.
We would not pay more for HPHT or CVD simply because a seller presents one as the superior method. Compare the finished diamond's cut, tint, transparency and price.
Is growing diamonds in laboratories a recent invention?
No. The technology is much older than today's jewelry market. General Electric's successful diamond growth in 1954 was an important industrial milestone. Early output was useful for applications such as cutting and grinding; producing attractive jewelry stones became practical later.
GIA's history of laboratory-grown diamonds describes that progress from industrial material to gem-quality stones. What feels new to many shoppers is the range of affordable finished jewelry, not the basic idea of growing diamond.
Are lab-created diamonds cheaper than mined diamonds?
Usually, yes, and the difference can be substantial. But a fixed percentage is not a reliable shopping rule. Prices depend on weight, shape, grades, seller markup and whether you are comparing a loose stone or a complete piece of jewelry.
Compare like with like. A low loose-diamond price excludes the setting; a ring price may include design work, metal and services. Two sellers can charge very different amounts for similarly graded lab-grown stones.
Our one-carat price comparison and two-carat guide show dated examples and explain the grades being compared. For the wider choice of sellers, see the cheapest places to buy lab-grown diamonds.
We would buy a lab-grown diamond for the jewelry you want to wear, not as an investment. A lower purchase price is useful even when resale value is modest. Do not assume either origin guarantees that you can recover what you paid at retail.
Are lab-created diamonds better for the planet?
Lab-grown diamonds do not require mining the diamond itself. That avoids the direct land disturbance associated with a diamond mine. It does not make production impact-free: growing, treating, cutting and transporting diamonds uses resources and energy.
The producer's electricity supply and processes matter. So do the metal and manufacturing behind the finished jewelry. A laboratory-grown stone in a gold ring does not mean that no mining was involved anywhere in the piece.
We would look for specific information about the producer, energy use and the scope of any environmental claim. The FTC warns against broad, unqualified claims such as “eco-friendly” for jewelry. Its diamond-advertising guidance explains why clear qualifications matter.
Are lab-created diamonds better for people?
Choosing lab-grown avoids the diamond-mining stage and its associated risks. It does not, by itself, prove good working conditions throughout the supply chain. Diamond growth, cutting, metal sourcing and jewelry manufacturing still involve people.
Ask what a jeweler can tell you about those stages. Specific sourcing information is more useful than a sweeping “ethical” label. We would apply that same standard to a mined-diamond seller rather than assuming all mined diamonds share the same history.
How is the diamond industry reacting?
Lab-grown diamonds are no longer limited to a few specialist stores. Our retailer reviews cover established jewelers offering both origins as well as businesses focused on lab-grown jewelry.
The market also changes. James Allen's offering has moved into Blue Nile, while Lightbox has closed. A dated recommendation or advertisement is not enough to establish where you can buy today.
For shoppers, the useful result is more choice. We would judge a seller by its actual diamonds, jewelry, service and prices rather than treating its support for one origin as proof of quality.
How to buy lab-grown diamonds
Start with the jewelry and a total budget. Then choose a shape and compare individual stones using the four Cs. Protect cut quality before spending on a grade difference you cannot see.
For a white-looking round, we often start by comparing F–H color and VS1–VS2 clarity, then include higher grades when the price difference is small. For other shapes, inspect the pattern and visible tint rather than applying a round-diamond rule to everything.
Read the actual grading report, view the diamond's video, and check the return terms for the finished piece. Our step-by-step buying guide takes you through those decisions in order.
Where to buy lab-grown diamonds
Ritani is a good starting point when loose-diamond value matters most. Grown Brilliance is worth comparing for finished jewelry and designs, while Blue Nile offers an established shopping experience and a broad selection. Our recommended jeweler comparison explains where each seller fits.
How to save on lab-grown diamonds and jewelry
Compare the final price of the piece, not just the discount percentage. A heavily promoted sale can still cost more than a competitor's everyday price. Check whether an offer applies to loose diamonds, settings or selected finished jewelry, and include shipping and any applicable taxes.
Our current deals can help you find an offer, but the right purchase is a diamond and setting you like at a fair total price. A larger advertised saving is not a reason to compromise on either.