For the health reason, I can tell the different because they are all jade. We usually say jade refering to Nephrite jade. Jadeite refers to emerald mainly coming from Vietnam. Hetian white jade is supreme nephrite jade. Jadeite has more colors to choose. Buy the one you like and but it in reliable jade store or shopping center. Reall jade is good for health, although someone doult that the mineral in jade can not affect on people's health.