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How Many Different Types of Precious Gems Are There On Earth?

April 26, 2017different earth gems precious types

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How Many Different Types of Precious Gems Are There On Earth?

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Gems are valuable, but some are much more valuable than others. Such gems as topaz, aquamarine, and garnet are called semi-precious, and cost much less than precious gems. There are only four minerals that are considered precious gems today: diamond, emerald, and two forms of corundum, ruby and sapphire. Pearl, which is not a mi