costume jewellery vs sequin

costume jewellery

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

sequin

noun
  • A sparkling spangle used for the decoration of ornate clothing. 

  • Any of various small gold coins minted in Italy and Turkey. 

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