4 C's : cut, color, carat, and clarity   

Very Slightly Included
(VS1-VS2)

Refers to diamonds which have very small inclusions that are difficult for a skilled observer to locate using a 10x microscope. Usually these inclusions cannot be seen without the aid of a 30x microscope. In rare instances, with larger stones, some VS1/VS2 inclusions can be seen with the naked eye, after first being located using a microscope.

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