White crystal teacups and tea sets are more common, and the price depends on the fineness, size and carving of the crystal you choose. The price of white crystal is not high at present. However, many amethysts on the market are colored crystals that have been changed by heat treatment and irradiation. If the radiation is less than 75 shellfish, such gems are harmless to the body, and some unscrupulous businessmen do not handle them according to strict requirements or improperly. Such colored crystals are harmful to human body, and white crystals that are easier to distinguish can be selected.