Gem vs Keystone

Gem

name

  • A ghost town in California. 

  • A diminutive of the female given name Gemma. 

  • A city in Kansas. 

  • An unincorporated community in Indiana. 

noun

  • A native or resident of the American state of Idaho. 

Keystone

name

  • A ghost town in North Dakota. 

  • A city and town in Iowa. 

  • A town in South Dakota. 

  • A census-designated place in Colorado. 

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