Ruby is a beautiful deep red precious gemstone that is highly sought after all over the world. And while you can’t find them everywhere, they are found in many parts of Africa, Australia, and the United States of America. On the Mohs scale of mineral hardness, the hardness of a ruby is rated as 9.0 out of 10, which makes this gem strong and more resident to things like scratches versus softer stones that have a lower Mohs rating. When evaluating the rubies for sale, you should also pay attention to the size, clarity, cuts, and color to ensure you’re finding the best loose ruby for your vision. The larger the rubies for sale, the rarer it is and the price will be higher.