These colored gems are called “fancy sapphires.” Sapphire’s Rainbow Colors ![]() Moreover, it can come in gorgeous colors such as violet, green, yellow, orange, pink, and purple. However, the September birthstone can also be white or black. In addition, the more iron present, the deeper and darker the blue color of the gem. Iron and titanium are accountable for the sapphire’s famous and strikingly deep blue color. Red corundum gems are put into their own category called rubies. The mineral corundum is naturally colorless, but trace amounts of elements such as iron, titanium, and chromium result in sapphires coming in a wide variety of colors except red. September birthstone sapphire is formed of the second-hardest mineral and belongs to the corundum family, the same as ruby.
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