The name “sapphire” can also apply to any corundum that’s not ruby, another corundum variety.
Depending on their trace element content, sapphire varieties of the mineral corundum might be blue, yellow, green, orange, pink, purple or even show a six-rayed star if cut as a cabochon.
A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum
Rubies have always been held in high esteem in Asian countries. They were used to ornament armor of noblemen in India and China.