If a one-carat brilliant diamond has a diameter of less than 6.5 millimeters, it will simply not look as if it weighs a carat. If it has a diameter of only 6.2 to 6.3 millimeters, the proportions are clearly not right: overall, it is too deep. The crown may be too high or the pavilion too shallow. It may be as a result of both of these factors together, or because the girdle is unusually thick. The depth of a brilliant diamond should ideally be between 59% and 62% of the stone’s diameter. At 57%, the stone is decidedly too flat, above 64% it is clearly too high, which reduces the stone’s brilliance. You would certainly find the stone less attractive, because instead of being optimally reflected, light would be directed toward the bottom of the stone or out of the sides. The advantage of buying from Bucherer is that we reject stones with less than ideal proportions.