Blue Sapphire : The gem related to Saturn?

Sapphire (comes from Hebrew word: ספיר Sapir). The aluminium oxide (Al2O3) single-crystal form mineral also known as corundum. Found naturally as gemstones or manufactured in large crystal boules for varied applications, including infrared optical components, watch faces, high-durability windows, and wafers for the deposition of semiconductors such as GaN nanorods. The corundum group consists of pure aluminium oxide. Trace amounts of other elements such as iron, titanium and chromium give sapphires their blue, yellow, pink, purple, orange or greenish color. Sapphire includes any gemstone quality varieties of the mineral corundum except the fully saturated red variety, which is instead known as ruby. Blue Sapphire is the gem related to Saturn, which is the planet of wisdom, integrity and discipline. It rules responsibility, leadership, ambition and wisdom born of experience. It's also the planet of renunciation and spiritual journey. Wearing an unheated blue sapphire of at least 1.5 carats is said to bring discipline and bestow the ability to govern and lead others. Blue sapphire can be substituted with blue spinel, amethyst, blue tourmaline of at least 3-4 carats.