No, according to Chow Tai Fook official website, if it is not maintained, the material layer on the diamond surface will be oxidized when exposed to oxygen, and it will be dull and shiny after being worn for a long time. Chow Tai Fook Jewelry & Gold Company was established in 1929, which is a reputable jewelry company. In 1960s, Chow Tai Fook was taken over by Mr. Zheng Yutong, and then his 999.9 pure gold jewelry became a model of the gold jewelry industry, thus becoming the most reliable jewelry & gold company in the world.