![]() In the Mohs hardness scale, the sapphire crystals are rated 9. With the exception of Ruby, which is the red conundrum, all other colors of Corundum are called Sapphires. The extra mineral compounds forming with the aluminum oxide are responsible for its color variation. Sapphire, however, forms a diversity of colors. This stone can be transparent or opaque with its true color being the color blue. ![]() ![]() Also, it can occur as granular or massive habits. ![]() Sapphires are a variety of Corundum which are aluminum oxide minerals, forming in bipyramidal, rhombohedral, and tabular crystal structures. ![]()
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