Permanent stain is a diamond brand of Chow Tai Fook jewelry brand, which has strict standards and requirements for the selection and quality of diamonds. The minimum weight of a permanently dyed diamond ring is 30 cents (0.30 carats). This means that the diamond weight of the permanently dyed diamond ring is not less than 30 cents, that is, 0.30 carat. Weight is the standard minimum, and there will be more diamonds to choose from.