Corindones are a type of mineral composed primarily of aluminum oxide. They are known for their hardness, ranking 9 on the Mohs scale, making them one of the hardest natural substances. Corindons can be found in various colors, including red, blue, and yellow, depending on the presence of trace elements. The most famous varieties are rubies and sapphires, which are highly valued in the gemstone market. These minerals are typically formed in metamorphic rocks under high pressure and temperature conditions. Corindons are often used in industrial applications, such as abrasives and cutting tools, due to their durability. Additionally, they are significant in the jewelry industry, where their beauty and rarity make them sought-after gemstones.