Well not too sure myself, I just got a hand held dryer that says it is ceramic and has tourmaline (some type of gemstone). on the side of the box it says:
"TOURMALINE CERAMIC HEAT TECHNOLOGY will
keep your hair healthy and shiny. It generates full
spectrum, infrared heat and ions which works on hair
molecules to dry them inside & out. This drying
process is gentle and quick; it minimizes heat damage
and makes hair less frizzy and more manageable.
Tourmaline crystals generate ions that smooth the
cuticle for silky, shiny hair."