I wonder this myself. I have both ceramics and my old gold and hot flat irons. I love my gold and hots. Nothing gets my hair straighter. I paid a lot for my cermaics and they do not get my hair as straight as the gold and hots. So I do not know. lol
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."