The lab-grown jewellery industry encompasses the producers, cutters, wholesalers, retailers and trade bodies that bring synthetic diamond and synthetic coloured gem material from reactor to consumer. As of the mid-2020s it is a maturing category with global revenue in the low tens of billions of US dollars, principally diamond, with smaller but significant volumes of synthetic ruby, sapphire, emerald and other species.

Producers

Diamond growth is concentrated in a handful of countries. India, principally in Gujarat around Surat, is the largest producer by stone count, with hundreds of CVD reactor operations of various sizes. China, with both CVD and HPHT capacity centred in Henan and Shandong, runs comparable volumes; the Henan industrial cluster around Zhengzhou supplies a significant share of the world's HPHT diamond rough including most of the industrial-grade material. The United States retains a smaller but technologically significant production base, including Diamond Foundry in California and several specialist HPHT operations. Russia, principally NDT and earlier the New Diamond Technology operation in St Petersburg, has been a major HPHT producer, though sanctions and supply-chain disruption since 2022 have complicated their position. de Beers's Lightbox plant in Oregon was a notable producer until its 2024 closure.

Cutters and certification

Cutting of lab-grown diamond rough is concentrated in Surat, with a smaller but growing presence in China, Israel and the United States. The same cutters who handle natural diamond rough are increasingly active in lab-grown, often on parallel tables with separate inventory tracking to prevent mixing. Certification flows principally through GIA, IGI, GCAL and several smaller laboratories, with IGI dominant on volume given its established footprint in Surat. Both GIA and IGI laser-inscribe lab-grown identification onto the girdle as a permanent disclosure.

Wholesale and retail

The lab-grown wholesale market is more transparent than the natural diamond wholesale market, in part because price competition is so intense and in part because the trade lacks the long-established networks and confidential pricing of the natural Antwerp and Mumbai trades. Online wholesale platforms publish current prices, and the spread between published and transacted prices is narrower. Retail penetration of lab-grown is highest in the United States, the United Kingdom, Australia and to a lesser extent Continental Europe; Asian markets, particularly China and India, have been slower to adopt at retail despite producing most of the global supply.

Retail strategies vary widely. Some retailers carry only lab-grown (the lab-grown only retailer category), some carry only natural, and many carry both with explicit segregation and labelling. Online-first retailers including James Allen, Brilliant Earth and With Clarity have been particularly active in lab-grown. The major chains have all introduced lab-grown lines, and the bridal counters of department stores increasingly feature lab-grown options.

Trade bodies

The Lab Grown Diamond Council, originally the International Grown Diamond Association, represents producers and traders. CIBJO's Laboratory-Grown Diamond Commission and the World Federation of Diamond Bourses Lab-Grown Committee handle international harmonisation of standards and disclosure. The Natural Diamond Council, the renamed Diamond Producers Association, represents the mined-diamond side and has been active in lobbying on disclosure and marketing claims.

Coloured stone synthesis

Synthetic ruby (Verneuil since 1902, flux-grown since the 1960s, hydrothermal since the 1970s), synthetic sapphire, synthetic emerald (Chatham, Gilson, hydrothermal Russian) and synthetic alexandrite are well-established categories. Their economic significance in finished jewellery is far smaller than that of synthetic diamond, and they have not undergone a comparable price collapse, partly because the natural coloured-stone market does not have a direct equivalent to the natural-diamond mass-market segment. Synthetic ruby and sapphire are widely used in industrial applications (watch jewels, laser components, scientific instrumentation) which absorb most production volume.

Issues and outlook

The industry faces several structural issues: ongoing price compression as growth costs continue to fall, the absence of a meaningful secondary market, regulatory pressure on environmental marketing claims, and the open question of whether the category will continue to commoditise or stratify into recognisable brands. Lightbox's closure in 2024 was widely read as a signal that even a well-funded brand operation could not sustain price points against the market floor. Retailer responses have ranged from full integration of lab-grown alongside natural to explicit refusal to carry the category.

From the standpoint of the broader gem trade, lab-grown has become a permanent, if economically subordinate, category alongside natural diamond rather than a replacement for it. The two markets coexist, are differently priced, attract differently motivated buyers, and are unlikely to merge.