How Many Precious Gems Are There?
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 mineral but the product of oysters, is also called a precious gem.
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Comments
What about Tanzanite?
What about Tanzanite?
Misconception of a diamond
But I don't understand how old, pressurized carbon (a diamond) can be considered as a precious gem? And isn't only expensive because the supply of diamonds is restricted?
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