Question

What is the difference of a gemstone a rock and Crystal

Answer 1

Crystals are pure substances that have molecules arranged in a regular geometric pattern. A gem can be a crystal whereas a crystal will not always be a gem. Gems can have mineral bases such as ruby or diamond and an organic base such as amber.
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Hope I helped :)

Answer 2

A gem is a stones that is used to make jewelry. A crystal is apure substance that has molecules arranged in "a regular geometric pattern". A gem can also be a crystal, whereas a crystal can not be a gem.

Hope this helps. <3