Blue sapphire is the birthstone for the month of September. Save money on gold blue sapphire earrings. Besides the ever popular sapphire stud earrings, we also offer dangles, drops and hoops. The most precious blue gemstone of them all, sapphire is valued for its incredible color, durability and luster. Sapphire's immaculate blue color is associated with wisdom, friendship and loyalty. Sapphire is the gemstone for the 45th wedding anniversary.