What makes a stone a gem?

Is a crystal a gem?

The difference between crystal and gem is that a crystal is made up of atoms or ions arranged in a definite order and a definite structure while a gem is a mineral that is very precious and occurs only in a limited geographical area. A crystal may be called a gem while a gem would not be called a crystal.

Is Pearl a gemstone?

While these others form as minerals underground, pearls have organic origins. They form within various species of freshwater and saltwater mollusks. Simply put, pearls are gems but not stones. … A type of freshwater mussel with a variety of freshwater pearls.

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