培育钻石概念持续走强，四方达20%涨停

Core Viewpoint - The cultivated diamond sector is experiencing significant growth, with several companies seeing substantial stock price increases, indicating a strong market trend in this industry [2] Company Performance - Fourfangda has reached a 20% limit up in stock price [2] - Huanghe Xuanfeng previously hit the limit up [2] - Companies such as Power Diamond, Huifeng Diamond, and World have all seen stock price increases exceeding 10% [2]