anklet vs costume jewellery

anklet

noun
  • A piece of jewelry/jewellery, resembling a bracelet but worn around the ankle. 

  • An ankle sock. 

costume jewellery

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

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