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Glossary of watchmaking

Inclusion

Inclusion | インクルージョン | 包裹体

Inclusion

An inclusion is a particle of foreign matter found within a gemstone. Inclusions can be another mineral, a liquid or a gas. Inclusions decrease the value of a diamond when visible with a 10X loupe, but are a means of identification in Ruby, Sapphire and Emerald in order to separate synthetic stones from natural ones.