The Forevermark inscription is a proprietary laser-applied mark placed on every diamond sold under De Beers' Forevermark brand. Comprising the Forevermark icon — a stylised diamond outline — alongside a unique numeric serial number, the inscription is applied either to the girdle or the table facet of the polished stone. It is invisible to the naked eye and requires magnification of at least 10× to read, though a dedicated Forevermark viewer supplied to authorised retailers renders it clearly. The mark functions simultaneously as a proof of authenticity, a link to the stone's grading documentation, and a record of its chain of custody from rough to retail.

Technical Specification

The inscription is produced using a precision laser operating at a scale measured in microns. De Beers has stated that the mark is approximately one fifth of a millimetre in height — smaller than a grain of sand — and does not affect the diamond's clarity grade, as it sits on the surface rather than constituting an internal inclusion. The process is carried out at secure, controlled facilities before the stone enters the retail supply chain. Each serial number is unique to a single diamond and is registered in Forevermark's proprietary database, allowing the stone's identity to be confirmed at any point in its commercial life.

Eligibility and the Forevermark Standard

Not every diamond qualifies for the inscription. Forevermark publishes criteria under which fewer than one per cent of the world's diamonds are deemed eligible. The stated requirements address cut quality, colour, clarity, and — critically — provenance: the rough must originate from mines that meet De Beers' sourcing standards covering environmental practice, worker welfare, and community impact. Diamonds that have undergone certain treatments, including fracture filling or high-pressure high-temperature (HPHT) colour enhancement, are excluded from the programme. This eligibility framework is central to the brand's value proposition, positioning the inscription not merely as an identity mark but as a quality and ethics certification.

Traceability and the Grading Report Link

Each inscribed diamond is accompanied by a Forevermark Diamond Report, issued by the International Institute of Diamond Grading and Research (IIDGR), a De Beers subsidiary. The report carries the same serial number as the inscription, creating a verifiable correspondence between the physical stone and its documented characteristics. Consumers and trade buyers can cross-reference the number through the Forevermark online verification portal. This closed-loop approach — inscription, report, and database — is designed to prevent substitution fraud and to provide a durable record that survives changes of ownership.

Distribution and Authorised Retailers

Forevermark diamonds reach the market exclusively through a network of authorised retail partners, a structure that mirrors the broader De Beers sightholder system. Retailers must meet brand standards relating to store environment, staff training, and consumer communication before they are permitted to stock inscribed stones. The inscription itself therefore carries an implicit assurance about the point of sale as well as the product. This controlled distribution model is a deliberate echo of the luxury goods sector's selective retail strategies, distinguishing Forevermark from commodity diamond channels.

In the Trade

Within the jewellery trade, the Forevermark inscription is recognised as one of the more robust brand-authentication mechanisms applied to diamonds, given that the mark is permanent, cannot be transferred to another stone, and is backed by a centralised registry. Independent gemmological laboratories, including the Gemological Institute of America (GIA), will note the presence of a laser inscription on their reports under the "additional grading information" section, though the verification of the Forevermark serial number itself remains the province of the IIDGR database. Trade professionals generally regard the inscription as a meaningful differentiator in the branded diamond segment, though they note that the underlying grading standards are those of the IIDGR rather than a fully independent third party.

Further Reading

• GIA — Diamond Laser Inscription