Sapphires offer an endless palette of blues, the most valuable of which come in a dark cornflower blue. They also come in virtually every color of the rainbow, but blue is the most prized. The word sapphire comes from the Latin "sapphiru" which means blue, and they have been worn since ancient times. According to tradition, a sapphire symbolizes trust and loyalty. Some Sapphires, called Star Sapphires, exhibit a star-like phenomenon known as Asterism. They are a 9 on the Mohs hardness scale, making them a very strong stone. Blue Sapphire is the official birthstone for September. Learn more about Sapphire from the Gemological Institute of America (GIA)