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

• An Introduction to Gemology
• What is a Gem?
• Understanding the Formulas in Gemology
• Gem Formation: How are Gemstones Created
• Uncommon Elements Make Uncommon Gemstones
• Guide To Gem Cutting Terms
• How Gems Are Classified 

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 engage students in the syllabus content.

Classes are taught in Bahasa Indonesia.