Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Inclusions of hematite in feldspar (sunstone), India
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Twin-crystal of chrysoberyl
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
Fire opal, Mexico
Dumortierite in rock crystal, Brazil, polarised light
Partially etched diamond crystal


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