The FTC Guides for the Jewelry, Precious Metals, and Pewter Industries — codified at 16 CFR Part 23 and commonly called the FTC Jewelry Guides — are the principal regulatory framework governing how jewellery, gemstones, and precious metals may be described, advertised, and sold in the United States. Issued and enforced by the Federal Trade Commission, the Guides establish mandatory disclosure standards for treatments, synthetic stones, and imitation materials, and set precise thresholds for metal-purity claims. Although technically guidance rather than statute, non-compliance exposes retailers, manufacturers, and importers to civil enforcement action, making adherence effectively obligatory across the American trade.

Scope and Legal Standing

The Guides operate under the FTC's authority to prohibit unfair or deceptive acts and practices in commerce, derived from Section 5 of the Federal Trade Commission Act. They do not carry the force of a criminal statute but function as the Commission's authoritative interpretation of what constitutes a deceptive trade practice in the jewellery sector. A business that follows the Guides can generally rely on that compliance as a defence; one that departs from them risks formal investigation, consent orders, and civil monetary penalties. The Guides apply to any party in the commercial chain — manufacturers, wholesalers, retailers, and online marketplaces — provided the transaction touches US commerce.

Key Provisions: Gemstones and Treatments

The gemstone provisions of the Guides require that any material enhancement or treatment that affects a stone's value, durability, or appearance be disclosed clearly and conspicuously. Specific categories addressed include:

• Heat treatment — disclosure is required when the treatment is not permanent or when it is not universally accepted in the trade for that species.
• Fracture filling and clarity enhancement — must be disclosed for all gemstones, including diamonds, where glass, resin, or flux has been introduced into surface-reaching fractures.
• Irradiation and coating — any colour alteration by irradiation, surface coating, or diffusion must be disclosed.
• Synthetic stones — a laboratory-grown or synthetic gemstone must be identified as such; use of the unqualified species name (e.g., "ruby" or "emerald" alone) is prohibited when the material is not of natural origin.
• Simulants and imitations — a material that merely resembles a gemstone without sharing its composition must be identified as an imitation or simulant.

The Guides explicitly prohibit the unqualified use of the word natural for any stone that has been treated in a manner not universally accepted in the trade, and they caution against terms that imply a rarity or quality the stone does not possess.

The 2018 Revision

The most significant modern update to the Guides took effect in 2018, following a lengthy public comment period. Several provisions were substantially revised to reflect changes in gemstone production and laboratory-grown diamond technology. Most notably, the 2018 revision removed the word synthetic as the sole required qualifier for laboratory-grown diamonds, permitting terms such as "laboratory-grown," "laboratory-created," or "[manufacturer name]-created" as acceptable alternatives, provided the qualifier appears with equal prominence to the species name. The revision also clarified that the term real is not inherently deceptive when applied to laboratory-grown stones, since such stones share the chemical and physical properties of their mined counterparts — a point of ongoing debate within the trade. Guidance on the use of the word cultured for laboratory-grown diamonds was tightened to prevent consumer confusion with cultured pearls.

Precious Metals

For precious metals, the Guides specify minimum fineness thresholds below which quality marks may not be used without qualification. Gold articles must meet a minimum of one carat fineness to be described as gold at all, and any article marked with a karat designation must be within one-half karat of the stated fineness. Platinum may be described as such only if the article contains at least 500 parts per thousand of platinum-group metals, with at least 950 parts per thousand if the word "platinum" appears unqualified. Silver articles must contain at least 925 parts per thousand of silver to be described as "sterling silver."

Industry Adoption and Related Organisations

The American Gem Trade Association (AGTA) and Jewelers of America (JA) both reference the FTC Guides in their respective codes of professional conduct, and compliance with the Guides is widely treated as a baseline standard of ethical practice in the US market. The Guides are also consulted — though not binding — by some international buyers and laboratories when assessing disclosure obligations for stones destined for the American market. Gemmological laboratories such as GIA routinely note treatment disclosures on their reports in language consistent with FTC requirements, reinforcing the Guides' practical reach beyond the retail counter.

Further Reading

• FTC Jewelry Guides — Official Text, 16 CFR Part 23 (ftc.gov)
• AGTA: FTC Guides Overview (agta.org)
• GIA Gems & Gemology: 2018 FTC Guides Update