GIA is the world’s foremost authority on diamonds, colored stones and pearls. A public benefit, nonprofit institute, GIA is the leading source of knowledge, standards and education in gems and jewelry. • Four Cs: Of course, beauty is in. Diamond Education. A diamond is the oldest item that anyone can own. Yadav deals with certified/graded diamonds from the most respected labs: GIA and EGL. Then he went to Gemological Institute…