Crossword Genius

Shiny button material (5)

Ross

I believe the answer is:

nacre

(Other definitions for nacre that I've seen before include "Mother-of-pearl - crane (anag)" , "inside of shell" , "valuable material" , "Constituent of inlay furniture" , "Mother of pearl" .)

I've seen this clue in the Newsday.com and The New York Times.
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