Sapphire vs Tiff

Sapphire

name

  • A female given name from English from the precious stone. 

noun

  • A stereotype of an aggressive and domineering black woman. 

Tiff

name

  • A diminutive of the female given name Tiffany. 

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