Grading fancy color diamonds is complex and specialized, and it takes highly trained laboratory graders to complete the process accurately. View Gallery. ... This includes all colors other than ...

In “Color grading of Colored Diamonds in the GIA Gem Trade Laboratory” (Gems & Gemology Winter 1994), King, Moses, Shigley, and Liu write: “GIA GTL [Gem Trade Laboratory] is aware that the grader can ...

For example, a fancy yellow diamond must grade higher than a Z on the GIA D-Z white diamond grading scale to earn its namesake. As fancy coloured diamonds are so rare, they are among some of the most ...

The source of color in diamonds was the topic of Rapaport’s latest GEMTalks episode, which featured two experts from the Gemological Institute of America (GIA). Dr. Ulrika D’Haenens-Johansson, senior ...

FCRE can be accessed n the FCRF’s website. Once logged in, the user can either input a GIA grading certificate number or manually enter the diamond’s carat weight, color, color strength, shape and ...

When a polished stone is returned to the GIA for grading, the laboratory will see if it has an identification number matching a rough stone on file. If a match is found, the natural fancy-colour ...

These digital tools are designed to grade the pavilion color. Creating a similar instrument for face-up color grading should be feasible. I propose that labs offer both the traditional pavilion color ...