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Sapphire Cell Phone Screens? At grade

Learn why sapphires might provide the basis for tougher cell phone screens in the near future.

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Valuable Substances

Are you a true one-percenter? See if you can name these expensive items!

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Most Common Gems

Name the most common gems, based on number of Google search results. Includes stones and also organic materials. Use the common English name

It is an educational content by JetPunk, site that contains ...

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