Chromium can cause the red color of ruby or the pink of pink sapphire. Only a few hundredths of a percent of iron and titanium can cause the color, and the more iron the corundum contains, the darker the blue. When the trace elements are iron and titanium, the corundum is blue sapphire. Most corundum contains color-causing trace elements. Colorless sapphires were once popular diamond imitations, and they’ve staged a comeback as accent stones in recent years.īut colorless corundum is rare. In its purest state, corundum is actually colorless. However, silicon is a very common element, making natural corundum relatively uncommon. The mineral corundum is composed only of aluminum and oxygen, and it requires a growth environment that’s free of silicon. Red corundum earns the name “ruby.” - Courtesy Omi Gems, Inc. Sapphires come in every color except red. Comprehensive CAD/CAM For Jewelry Certificate
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