cut glass vs lead crystal

cut glass

noun
  • Glass that has been cut, using an abrasive wheel, into a decorative pattern of facets. 

lead crystal

noun
  • cut glass made of this material. 

  • glass that contains at least 24% lead oxide (PbO). 

How often have the words cut glass and lead crystal occurred in a corpus of books? (source: Google Ngram Viewer )