breastpin vs locket

breastpin

noun
  • An ornamental pin attached to clothing in a person's upper chest area; a brooch. 

locket

noun
  • A pendant that opens to reveal a space used for storing a photograph or other small item. 

  • A small white marking on a cat's coat. 

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