Crossed Filters: a device consisting of two polarizing filters arranged so that the allowed plane of vibration of one is oriented at 90° to that of the other filter (see also Crossed-Filter Polariscope).
Crossed Filters: a device consisting of two polarizing filters arranged so that the allowed plane of vibration of one is oriented at 90° to that of the other filter (see also Crossed-Filter Polariscope).
IGR (Rivista Italiana di Gemmologia/Italian Gemological Review) è la rivista gemmologica internazionale italiana, nata nel 2016 da Gem-Tech con l’obiettivo di sviluppare in Italia un network informativo per Gemmologi e per professionisti quotidianamente impegnati nel settore delle pietre preziose.
IGR – Rivista Italiana di Gemmologia, the Italian Gemological Review, is the leading International Gemological Magazine in Italy masterminded by Gem-Tech Gemological Institute, a broad information framework for Gemologists as well as professionals involved daily in the gemstone business.
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