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Gem is a rare mineral that is highly priced. Gems are beautiful stones that are used in making jewelry. 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.Crystals are solids that have atoms, ions and molecules fixed in a regular order, which extend in three dimensions. Crystals can also be defined as objects that have well-defined geometric shape.When comparing the value of crystals and gems, the latter ones are priced more.