Cambridge blue vs turquoise

Cambridge blue

adj
  • Of a light bright blue color. 

noun
  • A light, bright blue. 

  • A medium spring green colour used by sports teams from the University of Cambridge. 

turquoise

adj
  • Having a pale greenish-blue colour. 

  • Made of turquoise (the gemstone). 

noun
  • A sky-blue, greenish-blue, or greenish-gray semi-precious gemstone. 

  • A pale greenish-blue colour, like that of the gemstone. 

  • turquoise 

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