Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Inclusions of hematite in aquamarine, Tanzania
Two-phase inclusion in amethyst, Brazil
Twin-crystal of chrysoberyl
Inclusion of apatite in ruby from Tanzania
Partially etched diamond crystal
Stress fissure («sun spangle») in baltic amber
Midge included in amber from the Baltic coast, polarised light


The Swiss Gemmological Society has the following objectives:

  • To promote the gemmological knowledge of its members
  • To extend this knowledge through annual training and to pass on the benefits thereof to the gemstone and pearl trades in the industry
  • Protect the interest of the purchasing public
  • Maintain ethical business practices, combat unfair competition and comply with the international guidelines of the diamond, gemstone and pearl trades