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What are rubies made of?

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Rubies are made from corundum or aluminum oxide. The corundum attains the distinctive ruby red color when chromium displaces some of the aluminum ions in the aluminum oxide; this process is called isomorphous replacement. read more

Rubies, as with other gemstones, are graded using criteria known as the four Cs, namely color, cut, clarity and carat weight. Rubies are also evaluated on the basis of their geographic origin. Color: In the evaluation of colored gemstones, color is the most important factor. Color divides into three components: hue, saturation and tone. read more

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