Gua sha material (4)

I believe the answer is:

jade

(Other definitions for jade that I've seen before include "Semiprecious stone - shade of green" , "Green stone; hack" , "Ornamental semiprecious stone" , "Semi-precious gemstone -- tired old horse" , "Green gem" .)

I've seen this clue in the USA Today.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.