Updated November 9, 2026

Lab-grown vs natural diamond

A lab-grown diamond is a real diamond: the same carbon crystal, as hard and as bright as a natural one. What differs is where it came from and what it is worth. A natural diamond formed deep in the earth. A lab-grown diamond is made in weeks, by chemical vapor deposition (CVD) or high pressure, high temperature (HPHT) growth.

What our scans show

From about 6,400 scans by about 2,100 people in the GemstoneAI app, January 21 to October 31, 2026, with test and staff accounts left out. Values are first-read estimates from photos, not appraisals.

Can you tell them apart by looking?

No. Not by eye, not with a loupe and not from a photo. Most handheld diamond testers read both as diamond, so they cannot tell you the origin either. A gemological lab separates them with spectroscopy and fluorescence imaging.

What you can check yourself:

• The lab report. Reports for lab-grown diamonds say so plainly. IGI report numbers for lab-grown stones start with LG.
• A laser inscription on the girdle, the thin outer edge. Many lab-grown diamonds are inscribed with their report number and a lab-grown mark. You need a 10x loupe to read it.
• The receipt. A lab-grown diamond has to be sold as one (see below).

How GemstoneAI handles it

Because a photo cannot settle it, GemstoneAI shows a colorless diamond with its other likely reading as well, usually lab-grown or a look-alike such as moissanite or cubic zirconia, each with its own value. Add the lab name and report number to the item, and a report that says lab-grown (an IGI number starting with LG, or a report reading laboratory-grown, CVD or HPHT) moves it to lab-grown pricing.

What sellers must call it

In the US, the FTC's Jewelry Guides (16 CFR Part 23) say it is deceptive to describe a lab-made stone as "real", "genuine" or "natural" (23.27). A seller who calls a lab-made diamond "cultured" must add a clear qualifier such as "laboratory-grown", "laboratory-created" or "[manufacturer name]-created" (23.12). Diamond treatments follow the same disclosure rule as other gemstones (23.14 and 23.24).

What each is worth

• New, a lab-grown diamond costs far less than a natural diamond of the same size and grade, and lab-grown prices have kept falling as production has grown.
• At resale the gap is widest. Many buyers pay little for lab-grown diamonds, while natural diamonds keep a resale market, though usually well below what they cost at retail.
• For insurance, the appraisal states what the ring would cost to replace, and a lab-grown diamond costs far less to replace. The lab report matters for the policy as much as for the price.

Which should you buy?

If you want the most size and sparkle for the money, lab-grown gives you that. If resale value or rarity matters to you, natural is the one that holds a market. Either way, buy with a lab report from a gemological lab and keep it with the ring.

Already have a diamond?

Photograph it with GemstoneAI for a first read on the stone, the setting and its value, with the lab-grown reading alongside. Your first scan is free.

Scan your diamond free

Featured in National Jeweler

Jewelry values from real scans

The middle first-read value from GemstoneAI scans of each kind. All jewelry values.

More jewelry guides

Is a lab-grown diamond a real diamond?

Yes. It is the same mineral, carbon crystallized in the same structure, with the same hardness and brilliance. The difference is origin and price.

Will a diamond tester show if a diamond is lab-grown?

Usually not. Most handheld testers read lab-grown and natural diamonds the same way. A gemological lab report, or a laser inscription on the girdle that matches one, tells you the origin.

Can GemstoneAI tell lab-grown from natural?

Not from a photo alone, and no photo can. The app shows the other likely reading with its value, and a lab report number you add that says lab-grown moves the stone to lab-grown pricing.