The GIA Diamond Cut Grading System assigns one of
these five grades to describe the overall cut quality
of a standard round brilliant diamond in the GIA D-to-Z
color range, and the Flawless-to-I3 clarity
range. Each cut grade represents a range of
proportion sets and diamond appearances, each of which
may conform in different ways to the characteristics
of that grade.
We have concluded that there are many different proportion sets that provide top-grade diamonds, and even wider ranges of proportions that are capable of providing pleasing upper-middle to middle-grade diamonds.
And while it is important to consider many components
when assessing the overall cut appearance and quality
of round brilliant diamonds, an individual's personal
preferences also play a role. The
GIA Cut Grading System provides an objective assessment
of a diamond's overall cut quality. Because each cut
grade represents a wide range of proportion
sets, the system also gives individuals the freedom
to choose which particular appearance they prefer.
With GIA's new system, the diamond
industry as well as the public can now use cut along
with color, clarity, and carat weight to help them
make informed and balanced decisions when assessing
and purchasing round brilliant diamonds.