Briar painted or coated in such a way that it sort of looks like a meerschaum pipe. (If you take off your glasses, squint, and tilt your head to side). It's Ivory/white fading to dark brown/black near the rim and the end of the shank. Usually on a sandblast or carved pipe.
"Nord-coat" is what it is actually called, so apologies for that, since googling "Nordcoat pipe" will definitely not lead you to tobacco pipes. A search with the hyphen in place will get better results.