Conoscope is a condensing sphere allowing to determine if a gem is unixial or biaxial
single and double bow tie - bi axial gems
Bulls eye and iron cross = uni axial gem
Conoscope + polariscope, different possible configurations
Chelsea
Polariscope

For more information watch this video
Dichroscope
 Conoscope
 UV

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Conoscope
Magnetism
Refractometer

Conoscope defintion

single and double bow tie - bi axial gems

Conoscope + polariscope

Other tools

Bulls eye and iron cross = uni axial gem

Lab tools
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