2. Because opal is a gem that can bring good luck, it should be worn on the left hand according to the principle of left entry and right exit. Opal, like minerals such as crystal, needs degaussing after wearing for a period of time, otherwise it will affect the feng shui energy. Degaussing method is very simple, opal can be irradiated in the sun for more than two hours. Pay attention to cleanliness and hygiene when wearing it at ordinary times, and don't be greasy.