All of the diamonds in our branded portfolios are graded by The Gemological Institute of America, the global standard in diamond grading. Each diamond is accompanied by its own G.I.A. certificate. This gives all of our investors the assurance that every single diamond adheres to a strict set of uniform grading guidelines according to the 4c's: Color , Clarity , Cut & Color. The factors of these 4 categories have the most influence in the determination of the price of a diamond.