Zhou Dasheng is a Hong Kong-funded brand with more than 300 branches in China. The quality of things and after-sales service can be assured. 18K has a good hardness, but it will fade if it is unstable for a long time. Although PT950 will not fade and its hardness is not as good as that of 18K, the price of diamonds of the same size and grade will definitely be cheaper than that of PT950. These diamonds are pure natural. Jane, you buy more than 20 cents of diamonds.