Lab-Grown Diamonds Explained

A lab-grown diamond is a real diamond. It is the same carbon, in the same crystal structure, with the same hardness and the same sparkle as a stone pulled from the ground. The only real difference is where it came from: a lab-grown diamond is created in a matter of weeks in a controlled chamber, while a natural diamond forms underground over roughly one to three billion years. 

For most buyers, the decision comes down to three things: cost, whether it holds value, and what to check before you hand over your money. This guide answers all three, from a Los Angeles dealer that carries both lab-grown and natural diamonds.

Are Lab-Grown Diamonds Real Diamonds?

Yes. A lab-grown diamond is chemically, physically, and optically identical to a natural one. Both are pure carbon crystallized in the same cubic structure, both measure 10 on the Mohs hardness scale, and both bend and split light the same way, so they sparkle the same to the eye. A lab-grown diamond is not cubic zirconia, and it is not a fake. It is a diamond that grew in a lab instead of the earth.

That word "grown" matters. A lab-grown diamond is a diamond. A simulant, such as cubic zirconia or moissanite, only imitates the look of one. Keep that distinction in mind, because it decides almost everything else about the stone: how it wears, how it grades, and what it is worth.

How are Lab-Grown Diamonds Made?

Lab-grown diamonds are made by two methods, HPHT and CVD, and both produce the same result: a real diamond grown on a tiny diamond seed. The difference is the process used to build the crystal.

Both routes have improved sharply in recent years, which is largely why lab-grown stones are so widely available now. To the naked eye, a well-cut HPHT diamond and a well-cut CVD diamond look the same, and both look the same as a natural stone of equal quality.

Lab-Grown vs Natural Diamonds: Which is Right for You?

The right choice depends on what you want the piece to do. If you want the largest, brightest stone your budget allows, lab-grown is usually the answer, because it costs a fraction of a comparable natural diamond of equal quality. If you want a stone with a resale market and a long origin story, natural still holds that ground. Neither is "better." They answer different questions.

Here is the honest part most sellers skip. A lab-grown diamond is a wonderful thing to wear, but it is not an investment. Production has scaled fast, prices have fallen, and the resale market for lab-grown stones is thin, so a lab-grown diamond bought today will likely fetch far less if you try to sell it later. Natural diamonds hold value better and have a real secondary market. If you see a ring as a piece to enjoy, lab-grown gives you more stone for the money. If you see it as an heirloom asset, weigh that against natural.

Two more points buyers ask about: 

• Sentiment: some people love the billions-of-years origin of a natural stone, and some love the modern, made-not-mined story of lab-grown. That is personal, and there is no wrong answer. 

• Environmental impact: both have a footprint, mining on one side and energy use on the other, so neither is impact-free. If that matters to you, ask about the specific origin of any stone before you buy.

Cut usually matters more to a diamond's look than a small change in size or shape, so once you have a budget, spend it on a well-cut stone in a shape you love. If you are still deciding on shape, our guide on marquise vs pear diamond shapes walks through how each one sits on the finger.

Lab-Grown Diamonds Vs Moissanite Vs Cubic Zirconia

Only lab-grown diamonds are chemically diamonds. Moissanite and cubic zirconia are diamond simulants: they imitate the look of a diamond but are made of entirely different material. This is the single most common mix-up we hear, so here is each one on its own.

Lab-Grown Diamond

• Pure carbon, in the same cubic crystal as a natural diamond.

• Hardness 10 on the Mohs scale, the hardest of the three.

• The same optical properties as a natural diamond, so it sparkles the same.

• It is a diamond, graded by the same major labs that grade natural stones. 

Moissanite

• Made of silicon carbide, not carbon.

• Hardness around 9.25, very durable but slightly softer than diamond.

• Throws more colored flash than a diamond, so the sparkle pattern reads differently up close.

• A real gemstone in its own right, but a simulant, not a diamond.

Cubic Zirconia (CZ)

• Made of zirconium dioxide, with no carbon at all.

• Hardness around 8.5, noticeably softer, and it can cloud, scratch, or dull over time.

• Used in inexpensive fashion jewelry rather than fine jewelry.

• A simulant, not a diamond.

So if someone asks whether a lab-grown diamond is just a fancy CZ, the answer is no. Unlike cubic zirconia, the stones in our lab-grown diamond jewelry are real diamonds, with the hardness and the grading to prove it.

Can You Tell a Lab-Grown Diamond from a Natural One?

Not by looking. You cannot tell a lab-grown diamond from a natural one with the naked eye, a jeweler's loupe, or a standard diamond tester, because a lab-grown stone is a diamond and reads as one. Telling the two apart requires specialized gemological equipment that detects the tiny growth features unique to lab-grown stones. This is exactly why the grading report matters more than your own eye when you buy.

What to Check Before You Buy a Lab-Grown Diamond

Before you buy any lab-grown diamond, insist on a recent grading report from a major lab and confirm it matches the stone in front of you. That one habit protects you more than anything else, especially when buying online. Work through this short list:

1. Ask for a recent grading report from a recognized lab such as GIA, IGI, or AGS. Reputable sellers supply one on request. You can read more about a lab-grown report on the GIA lab-grown diamond report page.

2. Confirm the report actually says laboratory-grown or lab-grown, so you know what you are buying.

3. Check for the laser inscription on the diamond's girdle and match its number to the report.

4. Read the 4Cs on the report, starting with cut, which drives how the stone looks, then color, clarity, and carat.

5. Buy from a seller who supplies the documentation and stands behind authenticity in writing.

If you would like a second read on a report before you commit, or help comparing two stones, an engagement ring consultation is the place to start. Call (323) 991-9697 or send an inquiry, and we will walk through it with you.

Where Lab-Grown Diamonds Make the Most Sense

Lab-grown diamonds make the most sense wherever size and sparkle matter more than resale value, which covers a lot of jewelry. Because the same budget buys a larger stone, lab-grown shines in pieces where carat weight carries the look.

• Lab-grown diamond engagement rings, where you want a larger center stone without stretching the budget, built in 14K or 18K gold to your specification.

• Lab-grown diamond tennis bracelets, where the whole effect comes from carat weight running the length of the wrist.

• Lab-grown diamond hoop earrings, where extra size reads as presence without a jump in price.

• Lab-grown diamond bracelets for men, one of the fastest-growing pieces we are asked about, where bold stones make the statement.

For a ring, spend on a well-cut center stone in a shape you love and let lab-grown carry the size. For everyday and fashion pieces, lab-grown lets you wear more diamond, more often.

Frequently Asked Questions

Are lab-grown diamonds real diamonds?

Yes. A lab-grown diamond is chemically and physically identical to a natural one: pure carbon with a hardness of 10, graded by the same major labs. The only difference is that it grew in a lab rather than the earth.

Are lab-grown diamonds worth it?

It depends on your goal. If you want maximum size and sparkle for your budget, lab-grown is worth it and gives you a bigger, brighter stone for the money. If you want a diamond with a resale market and long-term value, natural has the deeper market.

Do lab-grown diamonds hold their value?

Not well right now. The resale market for lab-grown diamonds is limited, and prices have fallen as production scaled, so buy one as a piece to wear rather than as an investment. Natural diamonds retain value better.

Do lab-grown diamonds pass a diamond tester?

Yes. A standard diamond tester reads whether a stone is a diamond, and a lab-grown diamond is one, so it passes. Distinguishing lab-grown from natural takes specialized lab equipment, not a handheld tester.

Are lab-grown diamonds cheaper than natural?

Yes, significantly, at equivalent quality. That price gap is the main reason buyers choose lab-grown, since the same budget buys a noticeably larger or higher-quality stone.

Can a lab-grown diamond be certified and insured?

Yes. Major labs grade lab-grown diamonds, and you insure one the same way you would insure a natural diamond, using the grading report and a valuation as the basis for coverage.

Hollywood Gems carries both lab-grown and natural diamond jewelry and ships across the United States from Los Angeles. We are a Chrono24 Trusted Seller, and every piece we sell is 100% authentic. If you are weighing lab-grown against natural, or want help with a specific piece, a jewelry consultation is the fastest way to get a straight answer. Call (323) 991-9697 or send an inquiry, and we will get back to you the same day.