You've been told that having a certificate or
a diamond grading report is important, and
as a responsible consumer, you get one –
unfortunately, you probably won't understand
a word of what is on that diamond grading
report, unless you are a jeweler.

On the color grading scale, D, E, and F
mean that the diamond has no color. G, H,
and I means that it has very little color. J, K,
and L means that the diamond has a slight
yellow color. P, Q, R, S, T, U, V, W, and X
means that the diamond is a darker shade
of yellow. Z means that the diamond has a
fancy color – other than white or yellow. 
On the color grading scale, D is the most
valuable, and X is the least valuable –
however diamonds that get a Z rating are
the rarest and most expensive diamonds
in the world.

There are many aspects to a grading report.
Figuring it all out can be very confusing. You
should talk to a jeweler you trust, and have
them explain everything on the diamond
grading report to you.