Ruby Pack 2 Wallpaper

驚人的Ruby和水晶照片高清壁紙

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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. Ruby is considered one of the four precious stones, together with sapphire, emerald and diamond.

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The quality of a ruby is determined by its color, cut, and clarity. All of these properties, together with carat weight, affect the value of a ruby.

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