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In page Gemstone:

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Synthetic gemstones share chemical and physical properties with natural gemstones, but there are some slight differences that can be used to discern synthetic from natural.[1] These differences are slight and often require microscopy as a tool to distinguish differences. Undetectable synthetics pose a threat to the market if they are able to be sold as rare natural gemstones.[citation needed] Because of this there are certain characteristic gemologists look for. Each crystal is characteristic to the environment and growth process under which it was created.