bibelot vs costume jewellery

bibelot

noun
  • A bauble, knickknack or trinket. 

  • A miniature book of an elegant design. 

costume jewellery

noun
  • Inexpensive jewellery, made of glass and other non-precious materials. 

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