You're comparing two diamonds that look identical on screen. One is listed as lab-grown, the other as natural, and the price gap is large enough to change the whole plan: the center stone, the setting, even the proposal date.
This guide explains lab-grown vs. natural diamonds in plain terms: what's the same, what's different, how prices have moved, what the paperwork should say, and how to compare two stones fairly. It also includes a seven-question check for comparing any two diamonds, a step most listings leave to the buyer.
Key Takeaways
- Both are diamonds. In lab-grown vs. natural diamonds, U.S. federal jewelry guidelines (revised August 16, 2018) define a diamond as a mineral of essentially pure carbon crystallized in the isometric system, with a hardness of 10.
- Origin is the difference. Natural diamonds formed deep in the earth up to about three billion years ago, while most lab-grown diamonds take under a month to grow.
- Your eye can't separate them. GIA explains that traditional gemological observation and "diamond detectors" can't reliably tell them apart; a 2024 lab review adds that conclusive identification usually takes several tests.
- Prices have fallen in both categories, faster in lab-grown. Analyst estimates for a generic one-carat round show lab-grown down about 84 percent and natural down about 40 percent between early 2016 and early 2025.
- Disclosure is required. Under the FTC guidelines, a lab-grown stone must be described with a clear qualifier such as "laboratory-grown" or "laboratory-created."
Quick Answer
- What's the difference between lab-grown and natural diamonds? Origin. Both are crystallized carbon with the same hardness, but natural stones formed underground over geologic time, while lab-grown stones are grown in controlled equipment, usually in under a month.
- Are lab-grown diamonds cheaper than natural diamonds? Analyst estimates say lab-grown prices fell faster, but compare the same carat, color, clarity, cut, and report date before trusting any "percent cheaper" figure.
- Can you tell a lab-grown diamond from a natural one by eye? No. Neither the eye nor a standard diamond detector separates them reliably, so rely on the grading report and any girdle inscription.
Lab-Grown vs. Natural Diamonds at a Glance
| Factor | Lab-Grown Diamond | Natural Diamond |
|---|---|---|
| Material | Crystallized carbon; essentially the same chemical, physical, and optical properties as a natural diamond | Crystallized carbon |
| Hardness | 10 on the Mohs scale | 10 on the Mohs scale |
| How It Forms | Grown in equipment by HPHT (high pressure, high temperature) or CVD (chemical vapor deposition) | Formed deep in the earth under extreme pressure and heat |
| Time to Form | Most sizes grow in under a month | Formed up to about three billion years ago |
| Visible | No difference you can see | No difference you can see |
| Reliable Identification | Gemological laboratory testing | Gemological laboratory testing |
| Must Be Disclosed As | "Laboratory-grown," "laboratory-created," or a similar clear qualifier | No qualifier needed |
The Core Differences: Origin, Not Composition
The distinction that matters is where the diamond came from. It doesn't change what the diamond is. Lab-grown stones have essentially the same chemical, physical, and optical properties as natural stones. The federal definition of a diamond describes the material and says nothing about where it formed.
What Stays the Same
Both categories are carbon arranged in the same crystal structure. The federal definition lists a hardness of 10, a specific gravity of about 3.52, and a refractive index of 2.42 (a measure of how strongly the stone bends light). Cut, color, clarity, and carat weight describe both types, so the 4Cs work the same way when you shop. For a deeper look at the facts, see our guide on lab-grown diamond facts every buyer should know.
What Differs: How Each Forms
Natural diamonds form deep in the Earth under extreme pressure and heat, up to about three billion years ago. Lab-grown diamonds start from a seed and grow in one of two ways. HPHT mimics the Earth's pressure and temperature. CVD deposits carbon from a gas such as methane onto a seed. Most sizes grow in under a month. Our CVD vs. HPHT comparison and our guide to how lab-grown diamonds are made cover each method.
Can You See the Difference?
No. Traditional gemological observation and "diamond detectors" can't reliably separate the two. Natural diamonds usually contain trace nitrogen and inclusions (tiny internal features) from their formation, but those clues belong to a lab's microscope, not a jewelry counter. Laboratories separate the two using growth patterns and fluorescence patterns that remain visible after a stone is cut. A 2024 review of one laboratory's work adds that conclusive identification usually takes several tests, and that a quick screening device returns only a "pass" or "refer" result.
For a buyer, that points to one practical rule: origin is proven by the paperwork and the stone's markings, not by how it looks. If you want the basics of what lab-grown means before comparing, start with our overview of what lab-grown diamonds are.
Price Comparison: What the Market Data Shows and How to Compare Fairly
Searches for lab-grown vs. natural diamonds are mostly price searches, and the answer starts with a limit: no single "percent cheaper" number holds for every stone. The gap depends on carat weight, color, clarity, cut, shape, report, and the date you check.
What the Trend Data Shows
Analyst estimates for a generic one-carat round diamond of VS clarity give a long-run picture. Between the first quarter of 2016 and the first quarter of 2025, the lab-grown estimate fell about 84 percent, and the natural estimate fell about 40 percent. In early 2016 the lab-grown estimate stood at about 83 percent of the natural one; by early 2025 it stood at about 22 percent.
Read those numbers with their limits in mind. They're analyst estimates, not transaction records. They cover one stone profile in U.S. dollars without an inflation adjustment, and the series has gaps in 2023 and 2024. They also don't tell you what any particular stone costs today.
Why Headline Percentages Disagree
Two articles can both be accurate and still quote different gaps. One compares one-carat stones, another compares two-carat stones. One uses wholesale indexes, another uses retail asking prices, and asking prices shift with what's online that day. A lab-grown stone and a natural stone with different color grades or different cut quality aren't a like-for-like pair, so the gap between them reflects more than origin.
How to Compare Prices Without Being Misled
- Match the specification. Same shape, carat weight, color, clarity, and cut grade, with a grading report for each.
- Match the setting. Compare identical metal, karat, and design, so the diamond is the only variable.
- Match the date. Check both prices on the same day and record them.
- Match what's included. Check whether the quote covers the report, shipping, and sizing.
If you're setting a budget first, our guide on how much to spend on an engagement ring walks through the decision, and our post on carat weight versus how big a diamond looks shows why two stones of different carat weights can face up similarly.
The Same-Spec Check: Seven Questions to Ask Before You Compare Any Two Diamonds
Most comparison guides tell you which category to pick. Few explain how to check that you're comparing the right two stones. Run any pair of listings through these seven questions, whichever type you're considering.
| Question | Why It Matters |
|---|---|
| 1. Does the report state origin on its first page? | The report, not the sales copy, is what documents whether a stone is lab-grown or natural. |
| 2. Is the report from an independent laboratory, and is the number checkable? | You can match the number on the report to the number on the stone's listing and, where available, to the laboratory's own records. |
| 3. Do the two reports use the same grading wording? | Lab-grown reports at one laboratory used broad color categories and descriptive clarity terms rather than the letter scale used for natural stones. Wording varies by laboratory and changes over time, so read each report's key. |
| 4. Does the report mention post-growth treatment? | CVD stones often receive heat or irradiation to adjust color. The GIA's 2024 review reported that about 80 percent of CVD stones it evaluated had post-growth treatment, typically HPHT. That figure covers one laboratory's submissions, not the whole market. |
| 5. Is there a girdle inscription? | Some lab-grown stones carry a "LABORATORY-GROWN" inscription on the girdle (the thin edge), and some carry invisible deep-UV markings. Not every stone does. |
| 6. Is the quote the same kind of price? | An asking price, a final price, and a price with the setting aren't interchangeable. |
| 7. What is the date on each price? | Market prices move, and the trend data above shows both categories have fallen over the past decade. |
A pair of stones that pass all seven questions gives you a clean comparison. A pair that fails two or three isn't a fair test, no matter how the listings are worded.
Certification and Documentation: What the Paperwork Should Show
The report is the document that settles origin, and it should do four things: identify the stone as lab-grown or natural, record the 4Cs, carry a report number you can verify, and match the stone you're buying. Report formats differ between laboratories, so the same stone can be described in different words on different reports. Our diamond certification comparison explains what each major report type covers.
Certification is also specific to the stone and listing. Check the report that comes with the exact piece you choose, and don't assume one listing's documentation applies to another.
Resale and Long-Term Value: What to Know Before You Buy
Neither type of diamond comes with a guaranteed resale value, and it's worth treating any promise of one with caution. The trend data above shows per-carat prices fell in both categories over the past decade. That's a reason to buy the diamond for the ring you want to wear, not for what it might fetch later.
If resale matters to you, ask the seller for any buy-back or exchange terms in writing before you pay, and compare them for each stone you're considering. Our post on whether lab-grown diamonds are worth buying for jewelry looks at the decision from the wearer's side.
Sustainability and Sourcing: What Origin Does and Doesn't Tell You
Origin alone doesn't answer environmental or ethical questions. Whether a stone was mined or grown says little about the energy used, the labor involved, the materials, the shipping, or how the stone moved through the supply chain. Each of those is a separate question with a separate answer.
So treat any broad claim, from any seller and about either type, as a prompt to ask for specifics: which attribute, measured how, covering which part of the supply chain, and in what time period. A seller that can answer those questions in writing is giving you something to evaluate. A slogan isn't.
Which One Is Right for You?
Neither category wins every comparison. Match the choice to what you're trying to get.
- If you want a specific size and grade for a set budget: Compare same-spec stones using the seven questions above, and see how much of your budget each leaves for the setting.
- If you care about geologic origin: A natural diamond is a category formed in the earth over geologic time.
- If you care about knowing exactly how a stone was made: A lab-grown diamond comes with a documented growth method, HPHT or CVD, and a report that states its origin.
- If you want a diamond's look and hardness: Both categories share the same material, so appearance won't separate them.
- If resale is a priority: Neither is guaranteed. Ask about buy-back terms in writing.
Lockstone Jewels Lab-Grown Diamond Jewelry Where Sustainability Meets Lifestyle
Lockstone Jewels sells laboratory-grown diamond jewelry. If you're leaning that way, these collections show how the category looks across styles. Specifications are listed per piece, so confirm them on the exact listing.
- Lab-grown diamond engagement rings: Here you can find the women's engagement rings from hidden halo to halo and three-stone to vintage-inspired in any diamond shape.
- Lab-grown diamond solitaire engagement rings: Solitaire rings are one-stone designs. The solitaire rings are available in 14K or 18K gold with Yellow, White, and Rose Gold tone options; for example, the 1.33-carat round cut knife edge band solitaire engagement ring and the 1.11 carat square emerald cut lab-grown diamond pave solitaire engagement ring.
- Lab-grown diamond stud earrings: These stud earrings are suitable for everyday wear, whether you visit the office or attend night parties with friends; even their daily look is unmatched. Our diamond stud earrings buying guide explains sizing and settings.
- Lab-grown diamond tennis bracelets: A tennis bracelet jewelry is a one kind of fine piece that a woman likes to wear daily on her wrist and match to any attire. The continuous line of diamonds enhances the personality appearance.
For a curated list, see our roundup of lab-grown diamond rings for women. To compare setting styles before you choose a stone, read solitaire vs. halo vs. three-stone engagement rings.
Frequently Asked Questions
1. Is a lab-grown diamond the same as moissanite or cubic zirconia?
No. A lab-grown diamond is a diamond. Moissanite and cubic zirconia are different materials with their own compositions and properties. The federal definition describes a diamond as essentially pure carbon, with a hardness of 10 and a refractive index of 2.42, and it's the material that sets the category, not the way a stone looks. Stones that merely resemble a diamond are called simulants, and a seller should name them as what they are. If a listing says "diamond," check that the report says so too, and note whether it adds "laboratory-grown."
2. What does a seller have to call a lab-grown diamond?
The August 16, 2018 federal guidelines accept qualifiers such as "laboratory-grown," "laboratory-created," or "[maker name]-created" placed clearly before the word diamond. They allow the word "cultured" only with one of those qualifiers. The guidelines also say "faux" doesn't adequately disclose that a stone isn't mined, and they treat "real," "genuine," and "natural" as deceptive when applied to artificially produced products. When you compare listings, wording is a quick test: a clear qualifier near the stone's name is what you should expect to see.
3. What should I ask if a report doesn't mention treatment?
Ask in writing whether the stone has had any post-growth treatment, which process was used, and where that information appears on the report. Then compare only stones with the same treatment status, since a treated stone and an untreated one aren't a like-for-like pair. Keep the seller's reply with your receipt. If a seller can't or won't answer, treat the documentation as incomplete and weigh that in your decision. Question 4 in the seven-question check above explains why the question comes up for some lab-grown stones.
4. Why can the same color grade look different on two reports?
Laboratories describe grades in their own wording, and practice has changed over time. One laboratory's lab-grown reports used broad color categories such as Colorless and Near-Colorless, and descriptive clarity terms instead of the abbreviations used on natural diamond reports. Other reports use letter grades. Don't compare letters to words directly. Find each report's grading key, translate both to the same scale if the key allows it, and ask the seller if it doesn't.
5. Do lab-grown diamonds come in colors?
Yes. Fancy-color lab-grown diamonds, such as yellow, pink, and black, are available as their own category. They're described by color, intensity, and shape rather than only the colorless scale, so the same-spec check still applies: match the color description, intensity, shape, and report before you compare two stones. A pink stone and a yellow stone of the same carat weight aren't interchangeable, and neither is a pale tint against a vivid one. Our colored lab-grown diamonds guide walks through the options and how they're described.
6. Can I get a bigger diamond for the same budget?
Sometimes, but that depends on the exact stones you compare, not on origin alone. Carat weight is only one input. Shape, cut quality, color, and clarity all change price and appearance, and some shapes face up larger than others at the same weight. A smaller stone with a stronger cut can look better than a larger one cut poorly. Our guide on which diamond shape looks the biggest helps you weigh weight against visual size. Then run both candidates through the seven-question check so the comparison stays like for like.
7. Will lab-grown diamond prices keep falling?
Nobody can reliably predict it, and this guide doesn't try. The analyst estimates cited above show prices fell in both categories between early 2016 and early 2025, but past movement isn't a forecast. A more useful approach is to decide the stone you want, compare equivalent options on the same day, and buy when the specification and the price both suit you. If a seller urges you to rush by pointing at future prices, ask for the comparison in writing.
8. Is it okay to tell my partner the diamond is lab-grown?
It's a good idea to be open about it. The report that comes with the stone states its origin, and a partner who learns that from paperwork instead of from you may have questions you'd rather answer yourself. Many people frame the conversation around what they chose and why: the shape, the size, the setting, the design. Share the report when you propose, or soon after, and answer questions plainly. You know your partner best, so choose the moment that fits. For ideas on the moment itself, see our proposal planning guide.
9. How should I care for a lab-grown diamond compared with a natural one?
Both are diamonds with a hardness of 10, so the stone itself doesn't call for different care. What changes your routine is the setting and the metal around it: prongs, bezels, and gold or platinum each have their own upkeep needs. Have the setting checked periodically, whichever stone you choose, and ask the seller what upkeep your specific design needs. A loose prong matters more to a ring's safety than the stone's origin does. Our lab-grown diamond jewelry care guide covers cleaning, storage, and insurance.
Final Thoughts
Lab-grown vs. natural diamonds comes down to origin, paperwork, and how fairly you compare. Both are diamonds, so appearance won't decide it. The report, the stone's markings, and the like-for-like price check will. Decide what matters to you, run the seven questions, and compare equivalent stones on the same day.
When you're ready to look at designs, browse lab-grown diamond engagement rings, the solitaire collection, or our lab-grown diamond rings for women roundup, or start a custom design.