Two-Phase inclusions and rutile needles in rock crystal from Brazil
Two-phase inclusions in tourmaline from Namibia
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Inclusions of hematite in feldspar (sunstone), India
Agate from Anzi, Maroc
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Agate from Reichweiler, Germany


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