The word "sapphire" has its roots in several ancient languages: the Arabic "safir," the Latin "sapphirus" (meaning "blue"), and the Greek word "sappheiros" for the island of Sappherine in the Arabian Sea where sapphires were originally found.
The Sapphire was in the 'Breastplate of Judgement' of Aaron, described in the bible.
The Ancient Persians called sapphire the "Celestial Stone", and they believed that the earth rested on a giant sapphire whose reflection gave the sky its color. Before and during the Middle Ages, it was worn by priests as protection from impure thoughts and temptations. Medieval kings of Europe used sapphires in rings and brooches, believing that it protected them from harm and envy. Warriors presented their young wives with sapphire necklaces so they would remain faithful. It was believed that the stone's color would darken if worn by an adulterer or adulteress, or by an unworthy person.