How to use polarizer in jewelry appraisal? How to use it?

How to use a polarizer:

1. Wash the gem and observe whether it is transparent.

2. Turn on the power switch of the polarizer and rotate the upper polarizer until the extinction position.

3. Place the gem on the glass table above the polarizer, rotate the gem horizontally by hand or tweezers for 360 degrees, and observe the light and shade changes of the gem.

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