jewel box vs pencil case

jewel box

noun
  • A usually clear hinged plastic container designed to hold a compact disc or similar optical disc. 

  • Any of the Chamidae, a family of bivalves. 

  • A box for storing jewels. 

  • A member of the second major generation of professional ballparks, built between 1909 and approximately 1940 and distinguished by a relatively compact layout, the use of steel and reinforced concrete as structural materials rather than wood, and the presence of one or more close-in upper decks of seating supported by pillars extending from the lower deck. 

pencil case

noun
  • An object purposed to contain different stationery like pencil, rubber, correction fluid, etc. 

How often have the words jewel box and pencil case occurred in a corpus of books? (source: Google Ngram Viewer )