Pics! Can you tell the difference between EX steep deep HCA 5.4 and EX HCA 1?

[Rhino]

Date: 8/5/2006 9:39:30 PM
Author: rogue
I posted the last picture I posted above again here, but with some arrows. The blue arrows show the darkness I was referring to. The black arrows show what I see in almost all stones and what I don''t think is a problem, but this looks like the dull area that you point to above. It looks similar in the photos, but I wonder if the intensity of the light lost is the key difference that makes one a ROD and one a ''normal'' feature of diamonds?

Judging from the photo with the arrows (and the others you posted) I don''t see the ring of death like I do in the shot I took. Your observation and the pix you''ve shared in this thread lead me to believe that GIA is right on with their observation testing regarding these particular angle combinations. Of course I want to see and confirm this for myself but I have found your commentary valuable and insightful rogue. (BTW Rogue is one of my favorite Xmen characters.

). I really appreciate it.

 

[Rhino]

Date: 8/5/2006 10:32:52 PM
Author: Garry H (Cut Nut)

Date: 8/5/2006 6:09:52 PM
Author: Rhino
I appreciate your commentary rogue. More than you know. Interestingly light leakage is enhanced against a black background so your comment doesn''t surprise me there. It''s your other comments that catch my interest in more normal viewing conditions. Attached is a picture I have here that is a GIA Very Good because of a deterioration in appearance (brightness) due to a visible ring of death. This first shot is a macro shot taken in diffuse daylight that is magnified with its accompanying DiamXray image and I''m pointing to the dull areas caused by the leakage with the blue arrows. It is this phenomena that I was curious to know if you saw or not in that stone, not against the black.

The next shot is scaled down more to size. Thank you kindly for this feedback rogue. I''m getting a couple of stones in my inventory recut and this was a proportion combination we have not received yet for our study.

Best regards and once again ... CONGRATS on your upcoming engagement.

Jonathan

Great example Rhino.

The bigger problem with that stone Rhino is the reduced light return of the outer girdle facets and lack of contrast that we would expect between the leakage and usually strong light return on a better stone.
Your stone would appear to be the same size or smaller than a stone of 10 to 15% less carat weight - which might cost 10 to 50% less. The well cut stone will also look far better when both were dirty.

Hi Gary!

Thanks man and your commentary is insightful here. Very true regarding the depth issues in this circumstance.

 

[Rhino]

Date: 8/6/2006 11:01:25 AM
Author: rogue
I''m not sure what I was seeing then, but when this was against a black background, I could definitely see the dark ring. Maybe I was in fact seeing the areas I noted with the black arrows that don''t look that dark in the picture?

Totally makes sense rogue. The areas you point to in the black arrows would be leakage visible against a black background. In more practical terms/usage, a stone like that I would not necessarily recommend to be set in a bezel mounting (as that would block light from underneath and give a similar view as you saw against the black background).

All the best,