It is common practice to use a microscope (or binocular loupe) to - TopicsExpress

It is common practice to use a microscope (or binocular loupe) to facilitate the search for inclusions in a diamond because it enables high magnification (10-80 times) without having to change lenses, and therefore without losing sight of the inclusion that was being examined. Some microscopes even have an ocular micrometer incorporated to accurately measure observed inclusions. This microscope must have a lower light source with a dark field as well as an upper light source.

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