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As gemstones, abrasives, and in lasers.
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Related questions
What colors are rubys?
Red
What colors do rubys come in?
red
What is rubys used for?
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Why are emeralds worth more than aquamarines if they are used with the same material berry?
The prices for precious gems is dependent on supply and demand - not on any particular physical property. If people prize a certain gem above another then they will pay more for it.Consider diamonds and Rubys. Diamonds are harder than rubys, in fact they are the hardest mineral know - yet Rubys are considered more valuable.
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Do rubys do more than jewelry?
Yes, the first successful laser, created in 1960 by Theodore Maiman used a ruby. They are still used in some lasers today.
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