chelsea filter
chelsea filter

Learn to Use a Diamond Tester and Chelsea Filter (Video)


Some very helpful gemology tools are easy to use. Learn about the Chelsea filter, diamond tester, and other simple instruments in this video.

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There are many gemology tools available. Some, like the refractometer and spectroscope, are mainstays of gemological testing that require a lot of practice to master. However, there are other instruments that are very easy to use that can also help you identify gems. This video will show you how to use the Chelsea filter, diamond tester, and other tools.

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This article is also a part of our Gemology Tools Mini Course, in the unit Measuring Optical Properties.

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Kyrylo Gubariev, Graduate Gemologist (GG, AJP)

Kyrylo Gubariev, Graduate Gemologist (GG, AJP) is a gemologist with a passion for sharing his knowledge with fellow gem lovers. Originally from Ukraine, he is currently based in Bangkok, Thailand.


Addison Rice

A geologist, environmental engineer and Caltech graduate, Addison’s interest in the mesmerizing and beautiful results of earth’s geological processes began in her elementary school’s environmental club. When she isn’t writing about gems and minerals, Addison spends winters studying ancient climates in Iceland and summers hiking the Colorado Rockies.

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