However, with red corundum, more chromium is present, giving it that dark pinkish to blood-red color.Įmerald: Emeralds are a variety of the mineral beryl. A ruby gets its color from chromium, as do purple sapphires. So, essentially, a ruby is a red sapphire (or red corundum). It is the only color of corundum that is not called a sapphire. When a mineral corundum is red, it is classified as a ruby. Ruby: A ruby is actually the same exact type of mineral as a sapphire, except it is red. While typically blue, a sapphire can be yellow, purple, orange, green or white depending on the various elements and how much it contains (for example, just a hundredth of a percent of iron and titanium will make it blue, and the more iron it has, the darker blue it will be). These trace elements within the aluminum oxide are what give a sapphire its color. It consists of aluminum oxide as well as other trace elements, such as iron, titanium, chromium, vanadium or magnesium. Sapphire: A sapphire is a variety of the mineral corundum. Hopefully this comparison will help you make a decision on which precious gemstone is right for you…
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