It is a star-shaped concentration of light reflected or refracted within the gem, making the sapphire jewelry even more outstanding and notable. In fact, sapphires show the phenomenon known as asterism (the star effect).
Pink sapphires form due to high amounts of chromium, and purple sapphires combine all three trace elements.įinally, some of these September birthstones can change color depending on the lighting. Yellow and orange sapphires are a result of the presence of iron and chromium. In fact, it can be used as an affordable substitute for diamonds. White sapphire is corundum without either presence of the elements, much similar to the diamond. 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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