Natural etching structure on a crystal face of diamond (trigons), polarised light
Twin-crystal of chrysoberyl
Dumortierite in rock crystal, Brazil, polarised light
Stress fissure («sun spangle») in baltic amber
Fluid inclusions containing mica and quartz, in aquamarine from Pakistan
Two-phase inclusion in amethyst, Brazil
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Partially etched diamond crystal

Contact

Swiss Gemmological Society
Secretary:  Rébecca Michelot
c/o BDO AG, Hodlerstrasse 5, 3001 Bern

T. +41 79 668 6989
E. info@gemmologie.ch