How the diamond engagement ring have been cut, polished and to what proportions and symmetry are important, as these factors determine the life, brilliance and dispersion of the diamond rings. If the cutting factors fall below standard the appearance of the diamond rings is adversely affected.
Usually the GIA Certified Diamond rough will be cut into whichever shape that requires the least amount of sacrifice. Marquise and oval shapes should have a length thats exactly twice the size of the width. If they are too narrow or too wide, the stone will loose light and appear too dark.
The first thing to decide when purchasing ideal cut diamond is the shape of the stone. There are nine major shapes of diamonds.