THE DIAMOND IS CHANGING ITS NAME

il y a 2 heures
3 min de lecture

Why the luxury jewelery industry is reopening the most consequential debate in modern diamond nomenclature

The most important diamond story of the week is not a new stone, a record auction or a spectacular high-jewelery collection. It is a word.

On September 6, the London Diamond Bourse publicly backed the use of “synthetic diamond” as the preferred terminology for laboratory-produced stones, encouraging its UK members to adopt the expression as best practice. The move follows a unanimous vote by affiliated exchanges of the World Federation of Diamond Bourses earlier this year and comes as the international jewellery industry debates a proposed revision of its terminology standards. The timing is significant. The centenary congress of CIBJO the World Jewellery Confederation is taking place in Vicenza from September 4 to 7, bringing together the international jewellery, gemstone and precious-metals trade. Its Diamond Commission is considering a revised Diamond Blue Book that would favour “synthetic” as the single term for non-natural diamonds. This is not a semantic quarrel. It is a battle over how value is communicated.

A question of scientific language

CIBJO’s Diamond Commission has laid out an unusually explicit argument. In its 2026 special report, the commission states that diamonds produced using High Pressure High Temperature (HPHT) or Chemical Vapour Deposition (CVD) are manufactured through controlled industrial processes. Although a crystal may increase in size during production, the commission argues that describing the product as something “grown” in a laboratory does not accurately convey its industrial origin.

The distinction matters because terminology in luxury is rarely neutral. Words influence perception, and perception influences value.

“Laboratory-grown” has become widely used in the consumer market because it describes a production environment and can suggest a process analogous to natural growth. “Synthetic,” by contrast, is a technical term that places the emphasis on manufacture and distinguishes the resulting material from a naturally formed diamond.

CIBJO is therefore attempting to move the conversation away from marketing language and towards material definition.

Yet the issue is far from settled. The CIBJO Laboratory Grown Diamond Committee has argued that consumers have become accustomed to “laboratory-grown” and that eliminating the expression could create further confusion rather than clarity. The debate therefore pits two competing principles against each other: familiarity in the marketplace versus scientific and nomenclatural precision.

The industry is moving but not uniformly

The London Diamond Bourse’s recommendation has no legal force and does not itself change UK law. Existing British guidance has permitted “synthetic,” “laboratory-grown” and “laboratory-created” as acceptable descriptions. The Bourse’s position is therefore an industry recommendation, not a new statutory requirement.

That distinction is essential.

Elsewhere, however, the regulatory landscape is already moving toward stricter differentiation. According to industry reporting, France requires man-made stones to be described using “synthetic” terminology, while Russian rules that took effect on September 1 require jewellery containing man-made stones to be labelled accordingly and reserve the unqualified term “diamond” for natural stones.

Britain has also seen increased scrutiny of advertising. Earlier this year, the UK Advertising Standards Authority upheld complaints concerning advertisements for laboratory-produced diamonds that did not adequately disclose their origin.

The vocabulary debate is therefore becoming part of a broader question: how should consumers be protected in a market where two materially different origins can produce stones with remarkably similar physical characteristics?

The real battle is over trust

For luxury jewellery, provenance is not an accessory to value. It is part of value itself.

The natural diamond industry’s argument rests heavily on geological rarity, while laboratory-produced diamonds are manufactured through technological processes. The two products may share the same fundamental chemical composition and crystal structure, but their origins, production systems and economic narratives are fundamentally different. That is precisely why terminology has become so contentious.

CIBJO is also examining how diamond grading and the traditional 4Cs , clarity, cut and carat should be communicated within this changing landscape. The commission has specifically connected the credibility of diamond grading with consumer confidence in the rarity and value of natural diamonds.

The implication for luxury houses is profound. As jewellery becomes increasingly transparent about provenance, the language surrounding a stone may become almost as important as its certificate. The industry is not merely deciding which word to print on a label. It is deciding whether luxury should describe a product through the language of aspiration or through the language of material truth. That is why this debate deserves attention beyond the diamond trade. The most valuable word in tomorrow’s diamond market may not be rare, exceptional or responsible. It may simply be natural.