Are penalties enforced for mislabeling lab-grown diamonds?

Diamond labelling violations can lead to real penalties, but enforcement so far has taken the form of warnings. The Federal Trade Commission (FTC) requires sellers to place lab-grown disclosures clearly next to the word diamond in every ad and product listing¹. In April 2019, the FTC tested that rule for the first time, warning eight jewelry marketers over disclosures buyers could easily miss². Civil penalties remain legally possible for repeat offenders³, though none has been publicly issued since. 

Key takeaways

• Retailers must disclose lab-grown origin clearly, placed next to the word ‘diamond’, in every ad, listing and social post.  

• Using the word ‘diamond’ alone for a lab-grown or simulated stone counts as mislabeling under FTC guidance.  

• Penalties are legally possible, but the FTC’s only public enforcement action was a round of warning letters in 2019. 

• A grading report from GIA or IGI states a diamond’s origin directly and can be verified independently. 

What must retailers disclose about a diamond’s origin?

Under the FTC’s Jewelry Guides, any diamond that did not form naturally in the earth must be identified as such wherever it’s advertised or sold⁴. Approved language includes laboratory-grown, laboratory-created, or a manufacturer’s name paired with createdv. The disclosure has to sit immediately next to the word diamond, not tucked into a hyperlink or a separate education page. 

The rule applies everywhere a retailer sells, including social media. A hashtag alone rarely counts as adequate disclosure, particularly when it appears in a long string of unrelated tags⁵. 

What counts as mislabeling?

Mislabeling starts with the word diamond used on its own. Under FTC guidance, describing a lab-grown or simulated diamond this way implies to a reasonable consumer that it formed naturally, even if a disclosure exists elsewhere on the page. 

Simulants marketed as sharing a natural diamond’s optical or chemical properties raise the same concern for the FTC, since buyers could reasonably assume they’re purchasing the real thing⁶. 

Are penalties actually enforced?

Enforcement runs through Section 5 of the FTC Act, which prohibits unfair or deceptive trade practices. A company that ignores the Jewelry Guides can face a formal complaint, and civil penalties become possible once the FTC has already found similar conduct deceptive in an earlier case. 

In practice, the FTC has used this power sparingly. The 2019 warning letters, sent to lab-grown sellers including Diamond Foundry and Ada Diamonds, remain the only public enforcement action against diamond-specific disclosure failures since the Guides were updated in 2018⁷. Some of the companies involved said the matter was resolved without further action. The FTC’s next scheduled review of the Guides is in 2028⁸. 

How can buyers verify a diamond’s origin?

A grading report from GIA or IGI states plainly whether a diamond is natural or lab-grown. The GIA laser-inscribes every lab-grown diamond it grades with the words ‘Laboratory-Grown’ along with a report number, a mark that stays on the diamond itself rather than just the paperwork⁹. 

For natural diamonds (opens in a new window), GIA’s Diamond Origin Report goes further, identifying the country where the diamond was found alongside its full grading details. Buyers can also verify a report independently through the issuing lab’s website, matching the report number against the diamond in hand rather than relying on the seller’s word alone. That verification is also what protects whether a natural diamond holds its value (opens in a new window) the way buyers expect, since origin is the single fact a resale market or insurer will always ask for first¹⁰. 

FAQs 

What do GIA and IGI certificates say about a diamond’s origin?

Both labs state origin up front, ahead of any other detail. IGI marks lab-grown reports ‘Laboratory-Grown’ or ‘Man-Made,’ and GIA laser-inscribes the same disclosure onto the diamond’s girdle, tying it to how a lab-grown diamond (opens in a new window) is identified. 

That origin carries through to clarity too. Natural diamonds form inclusions over billions of years underground, a fingerprint unique to each stone, while lab-grown diamonds tend toward far greater uniformity given their controlled growing environment, a difference the diamond clarity (opens in a new window) section of the report reflects directly. 

How can a buyer verify whether a diamond is natural or lab-grown?

Start by confirming the grading report itself. A report number can be verified directly on the issuing lab’s website, so anyone unsure whether they’re holding a real diamond (opens in a new window) can match the inscription against the certificate. Natural diamonds also list a country of origin; a line lab-grown reports omit. 

How does the US regulate lab-grown diamond labelling?

Federal rules require lab-grown diamonds to be labelled clearly, next to the word diamond, wherever they’re sold. That requirement runs through the FTC’s Jewelry Guides, which treat disclosure as consumer protection rather than industry preference. 

Sources

1. eCFR. 16 CFR Part 23 — Guides for the Jewelry, Precious Metals, and Pewter Industries. https://www.ecfr.gov/current/title-16/chapter-I/subchapter-B/part-23. Accessed July 14, 2026. ↩︎
2. Federal Trade Commission. FTC Sends Warning Letters to Companies Regarding Diamond Ad Disclosures. https://www.ftc.gov/news-events/news/press-releases/2019/04/ftc-sends-warning-letters-companies-regarding-diamond-ad-disclosures. Accessed July 14, 2026. ↩︎
3. Federal Trade Commission. The many facets of advertising diamonds with clarity. https://www.ftc.gov/business-guidance/blog/2019/05/many-facets-advertising-diamonds-clarity. Accessed July 14, 2026. ↩︎
4. eCFR. 16 CFR Part 23 — Guides for the Jewelry, Precious Metals, and Pewter Industries. https://www.ecfr.gov/current/title-16/chapter-I/subchapter-B/part-23. Accessed July 14, 2026. ↩︎
5. Federal Trade Commission. The many facets of advertising diamonds with clarity. https://www.ftc.gov/business-guidance/blog/2019/05/many-facets-advertising-diamonds-clarity. Accessed July 14, 2026. ↩︎
6. Federal Trade Commission. The many facets of advertising diamonds with clarity. https://www.ftc.gov/business-guidance/blog/2019/05/many-facets-advertising-diamonds-clarity. Accessed July 14, 2026.www.ftc.gov/business-guidance/blog/2019/05/many-facets-advertising-diamonds-clarity/ ↩︎
7. JCK. FTC Cautions Sellers of Lab-Grown and Simulant Diamonds. https://www.jckonline.com/magazine-article/ftc-lab-grown-diamond-sellers/. Accessed July 14, 2026. ↩︎
8. JCK. Russia’s Requiring Lab-Growns Be Called “Synthetics.” Could the U.S. Be Next? https://www.jckonline.com/editorial-article/russia-lab-growns-synthetics/. Accessed July 14, 2026. ↩︎
9. GIA. Colored Diamonds: Diamond Grading & Reports. https://4cs.gia.edu/en-us/types-gia-reports/. Accessed July 14, 2026. ↩︎
10. IGI. Diamond Reports For Authenticity With Certification. https://www.igi.org/reports/diamond-reports/. Accessed July 14, 2026. ↩︎