A股早评：沪指低开0.47%，培育钻石概念高开，黄金、半导体板块调整

Market Overview - The A-share market opened lower, with the Shanghai Composite Index down 0.47% at 3915.48 points, the Shenzhen Component down 0.67%, and the ChiNext Index down 0.96% [1] Sector Performance - The cultivated diamond and graphite electrode sectors opened high, with Hui Feng Diamond rising over 21%, and both Si Fang Da and Huang He Xuan Feng hitting the daily limit [1] - The controllable nuclear fusion concept continued its upward trend, with Ha Wan Hua Tong increasing by approximately 15%, and both Yong Ding Co. and He Zhuan Intelligent hitting the daily limit [1] - The gold and non-ferrous metal sectors experienced adjustments, with Xiao Cheng Technology and Western Gold falling over 5% [1] - The semiconductor sector opened lower, with Hua Hong Semiconductor and Dongxin Co. both declining over 5% [1] Regulatory Impact - The Ministry of Commerce and the General Administration of Customs implemented export controls on superhard materials and artificial graphite negative electrode materials [1] Technological Development - The advanced steady-state Tokamak device (BEST) developed independently by China has recently commenced full construction [1]