Polarization device for expanding stereo microscopes
Polariscopes show whether the material exhibits single or double refraction. They also show elongation and twinning, which helps distinguish artificial from real gems. This extension is primarily used for analysis with brightfield or Transmitted mode used. Here, the light that has passed through the stone is analyzed using parallel or crossed polarizers.
The polarization device consists of a fixed polarization filter (polarizer) under the object to be examined and an insertable/movable polarization filter (analyzer) located above the object.
Examples of good practise and tips for examining with the polariscope device and identifying imitation gemstones or distinguishing between ruby and tourmaline can be found in the article: Distinguishing gemstones from glass .
Background information on examinations with the polariscope can be found in the Polariscopy article.