We try to first check if the diamond is not CZ and other diamond stimulant material. If confirmed that it is a diamond we proceed with the pricing of the diamonds.
For smaller parcels we sort it into corresponding group for shapes for example like in groups of round, princess, old cut, new cut , rose cut or broken.
For bigger diamonds we grade each diamond separately based on 4 Cs of the stone.
When looking at the proportions of a diamond, a trained eye would distinguish between an ideal cut and a deep or shallow cut.