ATC Coloured Gemstones

(5 days, 4000.- Swiss Francs)

This advanced training course is an intense gemmological programme that offers a detailed hands-on approach to identifying treatment and origin of ruby, sapphire and emerald. The course syllabus is built up in a modular structure.

Aims of this course:

We demonstrate the possibilities and restrictions of treatment detection and origin determination of corundum and emerald. Participants should subsequently be able to recognize the most characteristic internal features in untreated and treated stones of different origins.

Day 1:

  • Heat treatment of ruby and sapphire
  • Microscopic features for detection of heat-treated rubies and sapphires
  • Practical work (using microscope) on a wide range of treated and untreated ruby and sapphire samples

Day 2:

  • Origin determination of ruby
  • Methods and possibilities of geographic origin determination of ruby
  • Typical characteristics and inclusions from major ruby deposits (e.g. Burma, Mozambique, Thailand)
  • Practical work (using microscope) on a wide range of ruby samples from different origins

Day 3:

  • Origin determination of sapphire
  • Methods and possibilities for geographic origin determination of sapphire
  • Typical characteristics and inclusions from major ruby deposits (e.g. Burma, Kashmir, Sri Lanka)
  • Practical work (using microscope) on a wide range of sapphire samples from different origins

Day 4:

  • Detecting clarity modification (i.e. fissure filling with oil, resin or wax)
  • Methods and possibilities for geographic origin determination of emeralds
  • Typical characteristics and inclusions from major emerald deposits (e.g. Afghanistan, Brazil, Colombia, Zambia)
  • Practical work (using mostly microscope) on a wide range of emerald samples from different origins

Day 5:

  • Practical training with microscope on wide range of stones from SSEF collection
  • Discussion of knowledge gained during the course
  • Presentation of the ATC- Coloured Gemstones Certificate of Attendance

Information on dates & prices of courses

For additional details on the content of the course please do not hesitate to contact us.