14K Yellow Gold Mystic Topaz Stud Earrings (0.75 cttw ; 5 MM Round Cut) 30 Day Easy Returns. Jewelry Gift Box Included 14K Yellow Gold Natural White Topaz stones are coated with a thin layer of film to give them a multicolored sheen. The process creates a wonderful rainbow colored effect on the stone. The process is not permanent, so extra care must be taken. The total carat weight of the 2 stones is 0.75 CT