Diamond Education | Cut

What does diamond "cut" mean?

Often mistaken as referring to the diamond’s shape such as round, emerald, oval, pear etc., the cut of a diamond is the diamond’s proportions, symmetry and polish. Though you may not see it upon first glance, a diamond cut has three primary effects on appearance: brilliance, fire and scintillation. Based on the 1919 doctoral dissertation of diamond cutter Marcel Tolkowsky, the best possible balance of brilliance and dispersion would result from a 57.5% table, 16.2% crown height, a 43.1 pavilion depth, no cutlet and a knife-edge girdle.

 Although any custom ring is beautiful to the beholder, the diamond’s cut is the most important factor in creating a diamond that is not only beautiful to the naked eye, but under microscopic proportions as well. Cut has the greatest influence on a diamond’s beauty because of how it interacts with light, or what we see as sparkle. When a diamond is cut to balance optimal appearance against weight, it sparkles because light bounces from the bottom of the diamond out of the top. A shallow cut allows light to leak out of the bottom, and if it’s too deep, then the light escapes out of the side decreasing that sparkle effect.

 When you choose one of our brilliant diamonds for your custom engagement ring from Sylvie Collection, keep these notes about a diamond cut to help you decide:

  • Diamonds with a cut grade of very good or good usually represent the optimal combination of beauty and value.

  • Cut has the greatest influence on a diamond’s appearance so a smaller diamond, yet heavier diamond may have more sparkle than a larger diamond.

  • When choosing a round diamond, Very Good may be best and a Good rating may be optimal for fancy shapes.

  • A well-cut diamond can have slightly lower color (G-H) or clarity (SI1-SI2) but because it is well cut, it will sparkle and create brilliance.

  • The more brilliant you want the diamond to be, the higher the cut rating.