Professor Sugianto, geologist from the University of Indonesia will conduct the classroom training

• How to Build a Home Gemology Laboratory
• The Optical Properties of Gemstones
• The Physical Properties of Gemstones
• Color Change Phenomena

DGL uses the "Flipped" classroom instructional methodology. This type of learning has the student study the IGS online instructional content prior to the class. In-class lessons are then used more to discuss, answer questions, have live demonstrations, hands-on training  and in other ways to engage students in the syllabus content.

Classes are taught in Bahasa Indonesia.