Colour zoning in ruby from Mong-Shu, Burma
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
Bubbles and swirls in moldavite (natural glass)
Natural etching structure on a crystal face of diamond (trigons), polarised light
Fluid inclusions containing mica and quartz, in aquamarine from Pakistan
Two-phase inclusion in amethyst, Brazil
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Inclusions of hematite in aquamarine, Tanzania


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