The quality of a ruby is determined by its color, cut, and clarity, which, along with carat weight, affect its value. ![]() Some gemstones that are popularly or historically called rubies, such as the Black Prince's Ruby in the British Imperial State Crown, are actually spinels. The color of a ruby is due to the element chromium. The word ruby comes from ruber, Latin for red. Ruby is one of the traditional cardinal gems, alongside amethyst, sapphire, emerald, and diamond. Other varieties of gem-quality corundum are called sapphires. ![]() ![]() Ruby is one of the most popular traditional jewelry gems and is very durable. A ruby is a pink-ish red to blood-red colored gemstone, a variety of the mineral corundum ( aluminium oxide).
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