To avoid spending huge amount on a piece that’s not worth it, keep in mind the 4 C’s of diamond. The 4 C’s of diamond are Cut, Clarity, Carat and Color. Isn’t it interesting to know that thousand million diamond engagement rings are sold every year and still people lack knowledge about a perfect piece of diamond. Out of the 4C’s of diamond, the diamond cut is the most important. But one should not confuse between diamond cut and diamond shape. Shape is just the outward appearance. To know about the quality of the cut of the diamond, remember that the incident light should enter the stone through the table and crown and should travel towards the pavilion where it reflects from one side to the other before bouncing back out of the diamond's table toward the observer's eye.