China’s LGDs emerge as winners in the AI boom

China’s lab-grown diamonds are emerging as a surprising beneficiary of the artificial intelligence boom, with demand climbing while they gain traction as a key component in advanced chipmaking. . Momentum has accelerated after several Chinese producers reported that clients validated their diamonds as effective heat spreaders and began commercial shipments.

Traditionally associated with jewellery, these synthetic gems are now being adopted as chip‑cooling materials, enabling denser and more powerful AI semiconductors.

Shares of related firms have staged sharp rallies, with Zhecheng Huifeng Diamond Technology Co and SF Diamond Co jumping 51% and 40% last week, respectively, and extending gains into this week. Their performance far outpaced the CSI 300 Index’s rise of 1%. Gains in this niche segment underscore investors’ search for new AI winners, as crowded hardware bets, from printed circuit boards to optical modules, have grown more expensive after a sharp rally.