- Joined
- Apr 5, 2012
- Messages
- 995
According to the tutorial on pricescope:
"Fancy Color begins beyond the grade Z in the color grading scale. While colorless, near colorless, faint and light diamond colors are graded from the face-down position. Laboratory graders assess fancy color diamonds from the face-up or top view of the diamond."
My question is, how do graders decide whether the diamonds should be graded as a fancy color or as a faint/ light color (ie whether to grade them face down or face up)?
I have been looking at some light yellow and brown diamonds in the U - Z range and I have noticed that especially in round brilliant cut, these often to seem to face up lighter than when they are viewed sideways on through the pavillion or face down? I think this might be because of the larger amount of white light returned by a brilliant cut when viewed face up than by other fancy cuts. I was wondering whether a situation could exist with a light yellow or light brown colored diamond where, graded face down they are darker than Z color (so possibly in the fancy range) but when graded face up they don't qualify as a fancy diamond because the color has been toned down as a result of the white light return from the round brilliant cut?
"Fancy Color begins beyond the grade Z in the color grading scale. While colorless, near colorless, faint and light diamond colors are graded from the face-down position. Laboratory graders assess fancy color diamonds from the face-up or top view of the diamond."
My question is, how do graders decide whether the diamonds should be graded as a fancy color or as a faint/ light color (ie whether to grade them face down or face up)?
I have been looking at some light yellow and brown diamonds in the U - Z range and I have noticed that especially in round brilliant cut, these often to seem to face up lighter than when they are viewed sideways on through the pavillion or face down? I think this might be because of the larger amount of white light returned by a brilliant cut when viewed face up than by other fancy cuts. I was wondering whether a situation could exist with a light yellow or light brown colored diamond where, graded face down they are darker than Z color (so possibly in the fancy range) but when graded face up they don't qualify as a fancy diamond because the color has been toned down as a result of the white light return from the round brilliant cut?