Through instructor presentation, more than 17 hours of lab time, integrated multimedia presentations and exclusive hands-on practice, you learn the deductive reasoning system - a step-by-step procedure for simplifying gem identification and detecting synthetic and treated gems. Gain experience by using professional gem-testing instruments. In this predominately hands-on class, you work with about 60 species of gemstones to practice the same effective testing procedures and identification skills used by GIA's renowned gemological experts.