The cut of a diamond is probably the most important part of buying a diamond because it determines its sparkle or brilliance.
The better a diamond is cut the more sparkle will show. The cut of a diamond has to be proportioned properly, you never want it too deep or too shallow. The ideal proportions of a brilliant round diamond are 60% -61% depth, the top or table of the diamond should be 54%-57% and the crown angles should be around 35%. You will see all of these percentages when buying a diamond with the certificate (we will get into certificates later) but more importantly you will see the diamond sparkle much more when it is cut properly.