Associated with diamonds (Exodus 28:18) and emeralds (Ezekiel 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; Compare Ezekiel 1:26).
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Sapphire'". "Easton's Bible Dictionary".