Sapphire (Greek: σάπφειρος; sappheiros, 'blue stone',[2] itself derived from Sanskrit "ShaniPriya" which probably referred instead at the time to lapis lazuli) is a typically blue gemstone variety of the mineral corundum, an aluminium oxide (α-Al2O3). Trace amounts of elements such as iron, titanium, chromium, copper, or magnesium can give corundum respectively blue, yellow, purple, orange, or green color. Chromium impurities in corundum yield pink or red tint, the latter being called ruby.

Ezekiel 1:26 Above the expanse that was over their heads was the likeness of a throne, as the appearance of a sapphire stone; and on the likeness of the throne was a likeness as the appearance of a man on it above.