Copper: chemical element with atomic number 29, atomic weight 63.55, and symbol Cu; a highly ductile and malleable metal, tougher than iron, and an excellent conductor of heat and electricity.
Copper
Copper: chemical element with atomic number 29, atomic weight 63.55, and symbol Cu; a highly ductile and malleable metal, tougher than iron, and an excellent conductor of heat and electricity.
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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