Lab-grown diamond concept index surges over 5% intraday, multiple listed companies respond.

On November 11, the lab-grown diamond concept index rose by more than 5% at one point during intraday trading and closed up 4.67%. Some listed lab-grown diamond companies recently issued price increase letters for rough stones, and their heat dissipation business has achieved small-batch commercialization. Power Diamond said its lab-grown diamond rough stones are mainly exported to India, prices are confidential, and terminal prices have not changed; Sifangda said it can process heat sinks of about four inches, has small-batch sample orders, and the price is about tens of thousands of yuan per piece; Huanghe Whirlwind said it has raised prices for rough stone products, with large single-crystal products increased by 10% starting from November 1, 2026, due to rising production costs and currency appreciation that have significantly increased operating costs; Zhongbing Hongjian said sales and shipments of lab-grown diamonds are normal. Industry insiders said the heat dissipation business has not yet formed large-scale revenue, and mass production will depend on downstream application progress. The biggest problem facing the industry remains improving profitability, and Huanghe Whirlwind is still loss-making.