Sapphires belong to the corundum mineral species, and while the distinctly deep, velvety blue variety is the most popular, lucky for those born in September, this gem exists in a broad spectrum of colours. It is also a member of the Big 3 of the most sought-after stones, besides ruby and emerald, and is the trio's most affordable.

In ancient Greece, Persia and the Middle Ages, blue sapphire was associated with the sky and prophecy, and as such, people wore it to tap into their intuition.

Sapphires are associated with the 5th and 45th wedding anniversaries.