$Refractometer$

Conoscope defintion

Conoscope is a condensing sphere allowing to determine if a gem is unixial or biaxial

single and double bow tie - bi axial gems

single and double bow tie - bi axial gems

Bulls eye and iron cross = uni axial gem

Bulls eye and iron cross = uni axial gem

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

Conoscope + polariscope

Conoscope + polariscope, different possible configurations

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

For more information watch this video

$Refractometer$