In mineralogy an inclusion is any material that is trapped inside a mineral during its formation. In gemmology it is a characteristic enclosed within a gemstone or reaching its surface from the interior. It is believed that some inclusions can be older than the host rock itself.
Inclusions are usually other minerals or rocks but they may also be water, gas or petroleum. In the case of Amber they can often be insects and plants.
Inclusions are one of the most important factors when it comes to gemstone valuation and whilst in some they affect clarity hence the value diminishes, in others such as Star Sapphires, Tourmalinated Quartz, Rutilated Quartz and Lodolite, they cause the value to increase.
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