A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum. Other varieties of gem-quality corundum are called sapphires. Ruby is one of the traditional cardinal gems, together with amethyst, sapphire, emerald, and diamond. The word ruby comes from ruber, Latin for red. Ruby is the Precious Red variety of Mineral Corundum. Ruby is Birthstone for July month. The hardness of Ruby is 9.00 on Moh’s scale of Hardness. Ruby is called Manik Stone in Hindi. So above are some famous rubies found in the world. Now let study about the ruby quality on the basis of its transparency, opacity, and translucency.
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