Associated with diamonds (Exodus 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 (Exodus 24:10; Comp. Ezek. 1:26).

Noah Webster's New International Dictionary of the English Language

1. (n.) Native alumina or aluminium sesquioxide, Al2O3; corundum; esp., the blue transparent variety of corundum, highly prized as a gem.

2. (n.) The color of the gem; bright blue.

3. (n.) Any humming bird of the genus Hylocharis, native of South America. The throat and breast are usually bright blue.

4. (a.) of or resembling sapphire; sapphirine; blue.