- consisting of sapphire; like sapphire, especially in color.
- a pale-blue or greenish, usually granular mineral, a silicate of magnesium and aluminum.
- a blue variety of spinel.
- a rare blue or bluish-green mineral that consists of magnesium aluminium silicate in monoclinic crystalline form and occurs as small grains in some metamorphic rocks
- a blue variety of spinel
- relating to or resembling sapphire
