Comparing diamonds of different size
When diamonds of different sizes are compared, the difference
in size can make grading more difficult because the larger stone shows the
color saturation more clearly. Beginners particularly tend to rate the
color lower because it is "apparently" more clearly visible. The effect
of the more intense color impact can be lessened by judging only the upper
third of the pavilion of the stone in color comparison (Fig 5).
||Here, too, breathing on the stone is to be recommended, for
it eliminates the larger reflecting surfaces of the large stone.
|Fig 5 The color
is most easily discernable at the point of the stone