Inclusions of hematite in aquamarine, Tanzania
Inclusions of gilalite aggregates in rock crystal from Brazil
Fire opal, Mexico
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Inclusions of hematite in feldspar (sunstone), India
Partially etched diamond crystal
Inclusion of apatite in ruby from Tanzania


Company Members
Swiss or Liechtenstein companies registered on the commercial register and who belong to the precious stone, jewellery and watch industry or gemmological laboratories can become members of SGS.

Active Members
Those who work in the jewellery and watch industry, the gemstone industry or one of the gemmological laboratories and who hold a gemmological title for diamonds and coloured gemstones can be accepted as active members after attending a regional seminar and a central continuing education course. The following titles are recognised: SSEF, GIA, FGA or the German Gemmological Society.

Candidate Members
Interested persons without a gemmological title can be accepted as candidate members. The person concerned may continue their gemmological training and should have the possibility to acquire the gemmological titles for diamonds and coloured gemstones / pearls within five years in order to become an active member of the society.

People who are interested in Gemmology may participate at any time in the continuing education courses of both the regional groups and /or the Central Continuing Education Courses. One is able to pay a participation fee for each course without any obligation to the SGS.

For further information, please contact us on: nfgmmlgch.