1. [n]  a light shade of blue
2. [n]  a transparent piece of sapphire that has been cut and polished and is valued as a precious gem
3. [n]  a precious transparent stone of rich blue corundum valued as a gemstone
4. [adj]  having the color of a blue sapphire; "sapphire eyes"

Sapphire
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1. \Sap"phire\ (? or ?; 277), n. [OE. saphir, F. saphir,
   L. sapphirus, Gr. ?, of Oriental origin; cf. Heb. sapp[=i]r.]
   1. (Min.) Native alumina or aluminium sesquioxide, {Al2O3};
      corundum; esp., the blue transparent variety of corundum,
      highly prized as a gem.
            Of rubies, sapphires, and of pearl['e]s white.
                                                  --Chaucer.
   Note: Sapphire occurs in hexagonal crystals and also in
         granular and massive forms. The name sapphire is
         usually restricted to the blue crystals, while the
         bright red crystals are called Oriental rubies (see
         under {Ruby}), the amethystine variety Oriental
         amethyst (see under {Amethyst}), and the dull massive
         varieties corundum (a name which is also used as a
         general term to include all varieties). See {Corundum}.
   2. The color of the gem; bright blue.
   3. (Zo["o]l.) Any humming bird of the genus {Hylocharis},
      native of South America. The throat and breast are usually
      bright blue.
   {Star sapphire}, or {Asteriated sapphire} (Min.), a kind of
      sapphire which exhibits asterism.
   

2. \Sap"phire\, a.
   Of or resembling sapphire; sapphirine; blue. ``The sapphire
   blaze.'' --Gray.
   

Associated with diamonds (Ex. 28:18) and emeralds (Ezek. 28:13); one of the stones in the high priest's breastplate. It is a precious stone of a sky-blue colour, probably the lapis lazuli, brought from Babylon. The throne of God is described as of the colour of a sapphire (Ex. 24:10; comp. Ezek. 1:26).