Color makes up one of the Four C's when talking about a
diamonds characteristics. First time diamond buyers often come in with the
assumption that all diamonds are colorless. However, the truth is that
colorless diamonds are very rare. Diamonds are graded on a scale from D to Z in
color.
How did the scale come about?
Before the Gemological Institute of America (GIA) came up
with the D to Z scale in the 1950's, jewelry stores would label their diamonds
A, B, and C or use numerical numbering systems to identify the color of their
diamonds. This influenced the GIA to start their scale at D, so that customers
would not confuse the GIA's color scale with any other scale. While some jewelers
still use their own color scales, many people in the jewelry industry across
the globe have adopted the GIA color scale to follow.
How does the scale work?
Diamonds D-F are categorized in the colorless section of the
scale. G-J are classified as near colorless. K-M you can start to see faint
yellow or browns in the diamond. N-R the color of yellow or brown is very
light. Finally, S-Z the color is light.
How is the color determined?
When grading a diamond's color, GIA compares a set of
different colored diamonds, called
masterstones, to the diamond they are grading. The GIA has three
gemologist compare the diamond to the masterstones and decide on a color. All
three gemologist have to agree on the color of the stone for it to be graded
that color.
Fancy-colored Diamonds
One fun fact about diamonds is that they can come in every
color (red, blue, green, and purple are just a few). These fancy-colored
diamonds do not follow the same D to Z scale as regular diamonds. GIA grades
colored diamonds by the intensity of their color (faint to light).
Fancy-colored yellow diamonds should not be confused with a off-colored diamond
that is low on the D to Z scale. Natural fancy-colored diamonds are valuable
and rare to find.