The name “sapphire” can also apply to any corundum that’s not ruby red, another corundum variety.
Besides blue sapphire and ruby, the corundum family also includes so-called “fancy sapphires.” They come in violet, green, yellow, orange, pink, purple, and intermediate hues. Some stones exhibit the phenomenon known as color change, most often going from blue in daylight or fluorescent lighting to purple under incandescent light. Sapphires can even be gray, black, or brown.
Sapphire is the birthstone for September and the gem of the 5th and 45th anniversaries.