emerald green vs olive green

emerald green

noun
  • A rich green colour, like that of an emerald. 

  • A durable vivid green pigment made from copper arsenate. 

adj
  • Of a rich green colour, like that of an emerald. 

olive green

noun
  • A green-yellow hue that is brighter and greener than olive. 

adj
  • Having this hue. 

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