what could the cause be? Please Help!

[bigwill]

I recently purchased a diamond that the GIA report stated has a "very good" cut. The diamond appears to be eye clean. However, when I tilt the diamond towards the ground, a dark area appears. The dark area disappears when I tilt it back up. It doesn''t appear to be an inclusion, so I was wondering if anyone would possibly know what could be causing this? The measurments of the diamond are below. I don''t have a picture of it to show what I am talking about.

Round Brilliant
.97 CT
I color
SI1 Clarity
6.28-6.40-3.89 mm
Total Depth: 61.4%
Table Size: 57%
Crown Angle: 34.0%
Crown Height: 14.5%
Pavilion angle: 40.6%
Pavilion Depth: 42.5%

 

[somethingshiny]

I don''t know the cause myself. Did you try what was suggested in your other thread? Changing the background color? Do you have a GIA cert you could post?

You can "bump" your post instead of creating a new topic. When a new post is added (to any topic), it automatically goes to the top.

 

[Kaleigh]

Girdle reflection??

 

[AdaBeta27]

Windowing? But that seems doubtful if it''s a modern RB cut.

 

[oldminer]

Garry Holloway showed me a GIA "Very Good Cut" a few months back that was a miserable cut, so the range of Very Good Cut, GIA is VERY WIDE and possibly not a narrow enough category to exclude problematic appearances in all cases.

To my way of thinking, a Very Good Cut should always be a diamond of a cut good enough for any reasonable person to see a very attractive diamond and at the same time to have allowed a moderate compromise in the cost for the stone when compared to an Excellent Cut, GIA. This is not the way things happen to be right now, but I always hope for a re-adjustment of grading categories which will be more narrow and well defined. It is like swimming against the tide, but hoping for change is a positive process and a lot friendlier than complaining about it and offering no solution. The solutions clearly exist.