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

• What Are Crystal Systems and Mineral Habits?
• How Gems Are Identified
• Gemstone Hardness and Wearability
• How Are Gemstones Treated and Enhanced?
• Gemology Tools
• How To Identify Gems
• 10X Loupe For Gemologists and Jewelers
• Tests Taking Tips and Strategies

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.