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1:20
YouTube
what the gem
How to use a conoscope to find a gem’s optic axis / Gemology
These are conoscopes! Used with a polariscope, they reveal the optic axis in anisotropic gemstones and help determine the optic sign. Place the gem between crossed filters when the light is fully blocked, then move it until you see rainbow colors, that’s where the optic axis is. Place the conoscope on that spot and the optic figure appears. A ...
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