any gem variety of corundum other than the ruby, especially one of the blue varieties.
a gem of this kind.
the color of this gem, a deep blue.
resembling sapphire; deep blue:
a sapphire sky.

any precious corundum gemstone that is not red, esp the highly valued transparent blue variety. A synthetic form is used in electronics and precision apparatus. Formula: Al2O3
(as modifier): a sapphire ring


the blue colour of sapphire
(as adjective): sapphire eyes

A clear, fairly pure form of the mineral corundum that is usually blue but may be any color except red. It often contains small amounts of oxides of cobalt, chromium, and titanium and is valued as a gem. Compare ruby.

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).


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