China's Lab-Grown Diamond Export Surge of 2026: The AI Cooling Revolution

China's lab-grown diamond exports are surging in 2026 due to a powerful combination of dominant production capacity, falling costs, shifting consumer preferences, and — most critically — a new wave of demand from the AI industry, which is adopting synthetic diamonds as high-performance heat spreaders for advanced chips .

Key Factors Behind the Export Surge

China produces roughly 95% of global synthetic diamonds, dominating the upstream supply chain from a production base concentrated in Henan province . The numbers are staggering: in May 2026, exports of lab-grown diamond rough hit 4.44 million carats worth $32.6 million — year-on-year increases of 136% in volume and 101% in value . For the first quarter of 2026, rough exports totaled 10.45 million carats, up 38% year-on-year .

Rapid technological improvements in HPHT and CVD synthesis have slashed production costs, allowing Chinese manufacturers to scale profitably. Power Diamond, a major producer, reported tripled profits in H1 2026 and expects revenue to nearly double to 450 million yuan .

Consumer preference is also shifting decisively away from natural diamonds. Lab-grown stones now feature in roughly six out of ten engagement rings in the US market , driven by prices that are often 80–90% lower than natural diamonds and growing ethical and environmental awareness .

How the AI Boom Is Expanding Industrial Applications

Diamond-as-a-heat-spreader: The breakout use case

Diamond has thermal conductivity roughly five times that of copper and ten times that of silicon, making it the "ultimate thermal solution" for AI servers and high-performance GPUs . As AI chips push power densities beyond 1,000 watts, conventional cooling materials can no longer keep up, and synthetic diamonds are being adopted as chip-cooling materials in denser semiconductor designs .

A landmark deal in early 2026 underscores the shift: an undisclosed US buyer placed a $300 million order for AMD Instinct MI350X GPUs cooled with lab-grown diamond, signaling a breakthrough in tackling AI data centers' massive energy consumption . Industry insiders widely view diamond-based thermal management as reaching an inflection point, with volume production potentially beginning by 2027 .

AI is also improving the diamonds themselves

Michigan State University, with a $3 million National Science Foundation grant, is using AI to grow higher-quality synthetic diamonds in laboratories, optimizing the chemical vapor deposition (CVD) process . AI-integrated systems in diamond cultivation now analyze real-time data on temperature, pressure, and crystal growth patterns during both CVD and HPHT processes, improving precision and yield .

Beyond cooling: A second growth engine

Synthetic diamonds are expanding into semiconductor substrate materials, advanced cutting tools, and electronics components, giving China's industry a second growth engine beyond jewelry . The global lab-grown diamond market is projected to reach $61.86 billion by 2033, with semiconductor applications as a key driver .

In short, the 2026 surge is a story of China's manufacturing dominance meeting an entirely new demand vector: the AI industry's desperate need for better heat management in chips, which diamond uniquely provides.