sapphire
noun /ˈsæfaɪə(r)/
  /ˈsæfaɪər/
 - [countable, uncountable] a clear, bright blue precious stoneTopics Clothes and Fashionc2
 - [uncountable] a bright blue colourTopics Colours and Shapesc2
 
Word OriginMiddle English: from Old French safir, via Latin from Greek sappheiros, probably denoting lapis lazuli.