About this directory: This page lists significant lab-grown diamond producers by country. Information is sourced from company websites, industry publications, trade reports, and GJEPC data. Contact details and production information change — verify directly with producers before commercial enquiries. Producers only: no traders, polishers, or retailers are listed here.
Contact information verified to the best of our knowledge at time of writing. Lab-grown is a fast-moving industry — confirm details directly before placing orders or making contact for commercial purposes.
China produces an estimated 60 to 70 percent of global lab-grown diamond rough by volume, primarily through CVD and HPHT operations concentrated in Henan Province (Zhengzhou, Nanyang, and surrounding areas). The scale is industrial: individual companies may operate hundreds of reactors. Most Chinese production is commercial grade — G to J colour, VS to SI clarity — and sold at low margins to international polishing centres including Surat.
Zhengzhou Sino-Crystal Diamond Co., Ltd.
Est. 1999 · Zhengzhou, Henan
China · HPHT + CVD
Products
HPHT and CVD synthetic diamonds for gem and industrial use. Gem range: 0.30ct to 3ct+, G-J colour, VS-SI clarity standard production. Also produces fancy yellow HPHT. Industrial grades include polycrystalline diamond for tooling.
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📍Zhengzhou High-Tech Industrial Development Zone, Henan Province, China
💡Sells primarily through Surat-based Indian polishing factories and international rough traders. Not typically accessible direct to small buyers.
Henan Huanghe Whirlwind Co., Ltd.
Est. 1979 · Xinxiang, Henan · Listed: Shanghai Stock Exchange
China · HPHT
Products
One of China's oldest and largest synthetic diamond producers. Primary focus is industrial diamond — abrasive, tooling, and wire drawing. Gem-quality production is a smaller part of the business. Also manufactures cubic boron nitride (CBN) for industrial use.
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📍Xinxiang City, Henan Province, China
💡Publicly listed on Shanghai Stock Exchange (600172). Annual reports available in Chinese. Primarily industrial focus.
Zhongnan Diamond Co., Ltd.
Est. 1988 · Nanyang, Henan
China · HPHT + CVD
Products
Large-scale CVD and HPHT producer with significant gem-quality output. One of the primary suppliers of CVD rough to Indian cutting factories. Also a major industrial diamond producer. Publicly listed on Shenzhen Stock Exchange.
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📍Nanyang City, Henan Province, China
💡Listed on Shenzhen Stock Exchange (002433). One of the largest synthetic diamond companies in China by revenue.
India's lab-grown diamond production is concentrated in Gujarat — primarily in Surat (cutting and integrated operations) and the surrounding area. Several companies have built integrated operations combining CVD growth with cutting, polishing, and export. India's competitive advantage is its existing diamond cutting expertise combined with increasingly cost-competitive reactor operations. Government policy support since 2023 has accelerated domestic growing capacity.
Fenix Lab Diamonds
Surat, Gujarat · Integrated grower and manufacturer
India · CVD
Products
One of India's largest integrated lab-grown diamond operations — CVD growth, cutting, polishing, and IGI certification under one operation. Gem-quality production: 0.30ct to 3ct+, primarily colourless range (D-H), VS-SI clarity. Significant export volumes to US and European markets.
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📍Surat, Gujarat, India
💡International B2B sales and export. Trade enquiries through website. IGI certified goods as standard.
Greenlab Diamonds
Gujarat, India · CVD grower
India · CVD
Products
CVD rough and polished production with focus on certified gem-quality goods for export. Colourless range with emphasis on D-F colour production. Supplies to international jewellery manufacturers and retailers.
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📍Gujarat, India
💡Focus on sustainability narrative — renewable energy powered production, which matters to buyers making environmental claims in their marketing.
IGI Certified
US-based lab-grown producers generally operate at the premium end of the market, with brand investment and quality differentiation from Chinese commodity production. US production costs are higher, but the brand premium and consumer trust associated with US-origin goods supports higher pricing in certain segments.
Lightbox Jewelry (De Beers Group)
Est. 2018 · Gresham, Oregon, USA · Production facility: Element Six
USA · CVD
Products
Lab-grown diamond jewellery brand owned by De Beers. Grows CVD diamonds at the Element Six facility in Gresham, Oregon. Flat pricing: all stones priced by carat weight only, regardless of colour or clarity — a deliberate pricing strategy to position lab-grown as fashion rather than luxury. Sells direct-to-consumer through lightboxjewelry.com and selected retail partners.
No IGI/GIA cert — proprietary grading
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📍Production: Gresham, Oregon, USA · Head office: London, UK (De Beers Group)
💡Consumer-facing retail brand only. Does not sell rough or unset stones. Note: stones are not independently certified by GIA or IGI — graded internally. Designed for fashion price point, not investment purchases.
WD Lab Grown Diamonds
Washington, DC area · CVD grower
USA · CVD
Products
Premium CVD diamond producer specialising in larger stones (1ct to 10ct+) and fancy colour lab-grown blues and pinks. Uses proprietary CVD technology originally developed at Carnegie Institution for Science. Premium quality tier: primarily D-F colour, VVS-VS clarity.
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📍Beltsville, Maryland, USA
💡B2B wholesale to jewellery manufacturers and retailers. Known for large CVD stones — one of few US producers capable of consistent +3ct gem quality CVD.
GIA Certified
New Diamond Technology (NDT)
Est. 2012 · St. Petersburg, Russia
Russia · HPHT (BARS)
Products
Premium HPHT diamonds grown using the Russian BARS apparatus. One of the few producers capable of consistently growing large, high-quality HPHT gems above 5 carats. Focuses on colourless and near-colourless range. Has produced HPHT diamonds above 10 carats of gem quality. Widely regarded as producing some of the highest quality HPHT gems available.
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📍St. Petersburg, Russia
💡B2B wholesale and select retail partnerships. Note: international access may be subject to current sanctions restrictions on Russian entities — verify compliance before commercial engagement.
GIA Certified
IIa Technologies
Est. 2007 · Singapore
Singapore · CVD
Products
One of the pioneers of gem-quality CVD diamond production. Specialises in Type IIa colourless CVD diamonds, which are used in both jewellery and technology applications (quantum computing, semiconductor research). IIa Technologies stones are often D-F colour, internally flawless to VS clarity. Also produces CVD for industrial and scientific applications including optical windows and quantum sensors.
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📍1 Cleantech Loop, CleanTech One, Singapore 637141
💡B2B and technology sector. One of the highest quality CVD producers globally. Premium pricing relative to Chinese production. Supplies to both jewellery and technology markets.
GIA Certified
Sarine Technologies Ltd.
Est. 1988 · Ra'anana, Israel · Listed: Singapore Exchange
Israel · Technology provider
Products
Not a diamond producer — included because Sarine is the dominant provider of technology used throughout the lab-grown diamond production and processing chain. Sarine's systems include the Sarine Clarity (inclusion mapping and grading for lab-grown), Sarine Light (light performance analysis), and DiaMension HD (proportion measurement). Their AI-powered grading systems are used by IGI and other labs for lab-grown diamond grading. Understanding Sarine is understanding how lab-grown diamonds get evaluated.
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📍Ra'anana, Israel · Offices in India (Mumbai, Surat), Belgium, Hong Kong, USA
💡Listed on Singapore Exchange (SGX: U77). Technology company, not a diamond producer. Their Sarine Profile system is used by over 1,000 diamond companies globally.
How lab-grown rough reaches the market
Understanding the supply chain from reactor to retail helps buyers know what they are actually purchasing and from whom.
The vast majority of lab-grown rough produced in China flows through a multi-step channel: Chinese producer sells rough to an international rough trader (often based in Dubai, Antwerp, or Mumbai) who then sells to a cutting and polishing factory (primarily Surat for the global supply). The polished stones are certified by IGI (most common for lab-grown) and then sold to international wholesalers and retailers.
Some Indian producers have vertically integrated: growing rough in Gujarat, cutting in Surat, certifying in Mumbai, and exporting to international B2B buyers directly. This shorter chain can offer better pricing at comparable quality.
US-based producers like WD Lab Grown and Lightbox sell direct-to-consumer or through selected retail partners, bypassing the rough trading chain entirely.
For a buyer at a jewellery store, the certificate tells you the quality but not who grew the stone. Most certified lab-grown diamonds do not disclose the growing country or producer on the certificate. If provenance matters to you — whether for ethical, branding, or quality reasons — ask the retailer explicitly and request documentation of origin.
India sourcing tip: For lab-grown diamonds in the Indian market, IGI Mumbai-certified stones from Surat factories offer the best combination of certified quality, accessible pricing, and domestic provenance. Ask your jeweller whether the stone was grown and polished in India or imported rough from China — the answer affects both price and provenance.