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What is a ruby used for?

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Rubies are used in jewelry and in other industrial applications.

Pocket watches used them as bearings and supports for internal components. In fact, it was a selling point to say that a pocket watch was "jeweled", in reference to the number of these gems in it (ie. 23-jewel)

Rubies are also used in industrial applications such as abrasive belts and lasers.

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