Fire opal, Mexico
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Structure in a healing fissure in topaz from Brazil
Stress fissure («sun spangle») in baltic amber
Colour zoning in ruby from Mong-Shu, Burma
Inclusions of hematite in feldspar (sunstone), India
Inclusions of hematite in aquamarine, Tanzania
Dumortierite in rock crystal, Brazil, polarised light

Objectives

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