New Post Gemmology Program

GTL Athens is offering post gemmology courses for gemmologists starting from the academic year 2016 - 2017.


The program focuses on observation and interpretation of inclusions in emeralds, rubies and sapphires.

Observation of inclusions will lead, after discussion, to conclusions concerning the geological environment and locality of formation. Conclusions will be drawn whether the stone has been treated, to what extend and by what means.

Duration: four months with two-hour sessions on a weekly basis.

Number of participants: 3-5.

Εγκλεισα τριών φάσεων σε σμαράγδι από το ορυχείο Muzo της Κολομβίας.Δυο θυγατρικοί κρύσταλλοι αλίτη σε κοιλότητα που περιέχει υδάτινο διάλυμα και φυσαλίδα πιθανώς CO2

Three-face inclusions in an emerald from the Muzo mine in Colombia.

Two daughter alite crystals in a cavity filled with CO2 solution and bubble.

Inclusions in ruby from the Mogok region, Myanmar.

Pleochroic colours with apatite and calcite crystals as satellites.


Beautiful apatite crystal in a sapphire from Myanmar.

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