Polariscope:help to  discriminate betwen singly and doubly refractive gems, determinate optic character uni of bi axial and pleochroism
Polariscope: how to use it. Place the stone between 2 cross polarised filter.
If it's all black it's a singly refractive gem, ift it's all white you have an agregate gem
Polariscope: double refractive visible every 90° and strain anisotropy if irregular exctinction
Polariscope: isotropic examples always black garnets, spinels, natural glass, fluorite, diamonds, opals and plastics
Examples Beryl, chrysoberyl, corundum, feldspar, Peridot, Quartz, topaz, tourmaline, diopside, tanzanite, kunsite, and zircon
Strain anistropy, examples: almandine garnet, amber, some diamonds, Verneuil sapphires, some plastic gems and some opals
Polariscope: Polycrystalline gems examples: jadeite, nephrite, chalcedony, agates, twin anomalies sapphire, ruby doublets and Hessonite garnets
Polariscope: Anisotrope stone exemple under polariscope, lit and dark every 45°
Polariscope exemple: re establishing light every 90°
Polariscope: isotropic exemples: transparent glass, translucent glass, translucent glass with inclusion and synthetic spinels.
Polariscope: isotropic exemples, almandine garnet and Pyrope garnet.
Polariscope: anisotropic exemples: quartzz, treated green Chalcedony and blue hemimorphite
Chelsea

For more information: visit www.gemologyproject.com
Polariscope
 Light polorisation
Dichroscope
 Polariscope
Magnetism
 UV

For more information, visit: http://www.geminterest.com

For more information, visit: http://www.geminterest.com

For more information, visit: http://www.geminterest.com

For more information, visit: http://www.geminterest.com

For more information, visit: http://www.geminterest.com
Conoscope

Polariscope: Principle

Polariscope: how to use it

Polariscope: singly refractive and agregate gems

Polariscope: double refractive and strain anisotropy

Polariscope: isotropic examples

Polariscope: anisotropic examples

Polariscope: strain anistropy

Polariscope: Polycrystalline gems

Polariscope: Anisotrope stone

Polariscope: exemple

Polariscope: isotropic exemples

Polariscope: isotropic exemples

Polariscope: anisotropic exemples

and the video here:

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