Microscope is a laboratory instrument used to examine items that are too small to be seen by the naked eyes. Appraiser investigating small objects and structures using a microscope to determine its quality and specs. The history of microscope is roughly 4000 years.
Microscope is the next step up after loupe. Appraisers adjust its power (magnifying) from 10x power to 30x power. Some professional researchers will use even more power (magnifying) to ensure the details and specs from 60x and up.
GIA (Gemological Institute of America) provides the best and most recognized report in the world. (Not value appraising)
If you are interested, below is the link which will direct you right to the website.
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