Ruby 3-Drop EarringsRuby is a rare gemstone variety of Corundum, the other famous variety being Sapphire. Corundum by itself is colorless, being made of only aluminum and oxygen, but Ruby is distinguished by its rich red color. This comes from small amounts of chromium replacing some of the aluminum. Natural Ruby often has tiny needle like crystals of Rutile and other inclusions, which helps distinguish them from synthetics and imitations. Gem variety Ruby that is