diaglyph vs inscription

diaglyph

noun
  • Glyptic art consisting of a sunken or depressed engraving or carving on a stone or gem. 

inscription

noun
  • Text carved on a wall or plaque, such as a memorial or gravestone. 

  • Words written in the front of a book as a dedication. 

  • The text on a coin. 

  • The act of inscribing. 

How often have the words diaglyph and inscription occurred in a corpus of books? (source: Google Ngram Viewer )