Are Lab-Grown Diamonds Real Diamonds?

Key takeaways

• The FTC's 2018 guidance broadened the definition of diamond while retaining clear disclosure requirements for laboratory-grown origin.
• IGI and GIA identify laboratory-grown diamonds through laboratory reports or assessments, although their report formats differ.
• A buyer should match the physical stone, laser inscription, report number, and online verification result.
• The certificate identifies an individual stone; it does not replace inspection or supplier-level QC for pairs and layouts.

What the FTC recognized in 2018

In 2018 the US Federal Trade Commission removed "natural" from the definition of diamond in its Jewelry Guides. The definition covers a mineral consisting essentially of pure carbon crystallized in the isometric system, whether mined or laboratory-grown.1 The change recognized the material identity of laboratory-grown diamonds; it did not make marketing language unrestricted.

The FTC also requires clear and conspicuous disclosure when a diamond is laboratory-grown, laboratory-created, or otherwise man-made. The qualifying term should appear next to the word diamond and should not be contradicted by surrounding language.2 In practice, "laboratory-grown diamond" is the safer plain-language description for a product page or wholesale record.

How IGI documents a lab-grown diamond

IGI's laboratory-grown diamond report identifies laboratory-grown origin and records information such as shape, measurements, carat weight, colour, clarity, polish, symmetry, and cut information where applicable.3 IGI states that growth method and treatments may be recorded in report comments when requested. That information can matter to a trade buyer managing product consistency, customer explanation, or destination-market disclosure.

IGI also provides online report verification and laser inscription. The report number can be used to check the laboratory record, while the inscription can help connect the document to the physical stone.4 Verification does not mean that every characteristic is independently guaranteed beyond the report's stated scope, so the buyer should still inspect the stone and order record.

How GIA documents a lab-grown diamond

GIA's current service for loose colourless-to-near-colourless laboratory-grown diamonds generally reports a Premium or Standard quality assessment, with "Laboratory-Grown" and the assessment number laser-inscribed on the girdle.5 This is not simply the conventional natural-diamond report format that many buyers know.

GIA also offers coloured laboratory-grown diamond reports with fuller assessment detail, including growth type and post-growth treatment. The correct report route depends on the stone, colour, downstream channel, and the level of detail the buyer needs. A GIA name may be important for a retailer's communication, while IGI's 4Cs-oriented format may be easier for broad wholesale comparison.

How to verify that the stone matches the certificate

A sensible verification sequence has several steps:

1. Check the report number online. Use the laboratory's official verification page, not an unrelated search result or a screenshot supplied without a live record.
2. Read the origin and method fields. Confirm that the document says laboratory-grown and review CVD, HPHT, or treatment information where provided.
3. Compare measurements and shape. Check the report against the stone, parcel record, images, or video.
4. Inspect the laser inscription where present. The number should correspond to the report and be legible under suitable magnification.
5. Check the seller's record. The invoice, packing list, report list, and shipment documentation should identify the same stone or lot.

For layouts, pairs, and melee, add a second layer of checking. An individual certificate does not prove that two stones match or that a parcel meets a calibrated size band. Group measurements, matching criteria, sorting records, approval images, and rejection terms remain necessary. This distinction is especially important in wholesale buying, where a buyer may receive many separately documented stones intended for one setting or production lot. The report answers "what is this stone?"; the group record answers "does this order meet the design requirement?"

Real does not mean identical to mined in every commercial respect

Laboratory-grown and mined diamonds share fundamental diamond properties, but their origin stories, supply chains, treatments, pricing, and resale markets can differ. A buyer should disclose laboratory-grown origin clearly and should not imply that a lab-grown stone is mined. The FTC's rule is about accurate representation, not about treating the two supply categories as commercially interchangeable.1

For related buying guidance, see certifications, CVD vs HPHT, and request a quote.