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A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum ( aluminium oxide ).
The red color is caused mainly by the presence of the element chromium.
Its name comes from ruber, Latin for red.
Other varieties of gem-quality corundum are called sapphires.
The ruby is considered one of the four precious stones, together with the sapphire, the emerald, and the diamond.
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