How Many Precious Gems Are There?
Posted August 24th, 2008 by admin
in
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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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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