coral vs ruby-colored

coral

adj
  • Made of coral. 

  • Having the orange-pink colour of coral. 

noun
  • The ovaries of a cooked lobster; so called from their colour. 

  • A piece of coral, usually fitted with small bells and other appurtenances, used by children as a plaything. 

  • A hard substance made of the skeletons of these organisms. 

  • Any of many species of marine invertebrates in the class Anthozoa, most of which build hard calcium carbonate skeletons and form colonies, or a colony belonging to one of those species. 

  • A somewhat yellowish orange-pink colour; the colour of red coral (Corallium rubrum) of the Mediterranean Sea, commonly used as an ornament or gem. 

ruby-colored

How often have the words coral and ruby-colored occurred in a corpus of books? (source: Google Ngram Viewer )