Gemology. Classroom in L.A., teacher at overhead projection, clean-cut men at tables with microscopes, various men looking at gems through microscopes, CU and ECU uncut 16 carat diamond under microscope, various scientist-type man testing gems in lab, refractometer, ECU fake emerald in water, ECU synthetic saphire refracting, ECU natural saphire, CU and ECU 55 point diamond held by tweezers.