Nottingham lace vs filigree

Nottingham lace

filigree

verb
  • To decorate something with intricate ornamentation made from gold or silver twisted wire. 

noun
  • A delicate and intricate ornamentation made from platinum, gold or silver (or sometimes other metal) twisted wire. 

  • A design resembling such intricate ornamentation. 

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