Ruby is an elegant red gem that is the birthstone for Julyand the gem for the 15th and 40th anniversaries. Ruby is the most valuable variety of the corundum mineral species, which also includes sapphire. All colors of corundum are considered to be a sapphire, except for ruby. Red is the color of our most intense emotions - love and anger, passion and fury. It is associated with objects of power and desire, such as fast cars and red roses.