When in gem form, they are called colorless sapphires. Sapphires and Rubies - Lets Talk Science The Al2O3 CrystalĬrystals of pure Al2O3 are known as corundum. Let us take a closer look at these two gemstones and at what sets them apart from one another.Ĭlick through for more information on Rubies The color is what sets each of these stones apart, caused by the particular internal structure of the mineral. Red sapphires would exist too except they were given their very own category, rubies.

Pink, orange, yellow, green, and purple sapphires exist as well. This mineral is found in an array of colors but is mostly known for its blue hue. Both rubies and sapphires are varieties of the mineral corundum. In fact, aside from their coloring, they are essentially the same stone. The thing that most people find the most shocking about rubies and sapphires when learning about them for the first time is that they are both from the same mineral. Sapphires and Rubies - How Different Are They Really?

Ruby and sapphire stone