echelon6
Shiny_Rock
- Joined
- Jul 5, 2007
- Messages
- 260
Date: 7/27/2007 9:23:11 AM
Author: risingsun
I'm sure that John will be along soon and explain this to you. Have you considered calling WF and speaking with John or Brian Gavin directly about the IS and ACA cut? You can also do a search on IS images and find a lot of info on what constitutes ideal to poor...good reading
Re-read what I said, under specific conditions, then read why in what Garry said, brighter lighting makes partial leakage look worse.Date: 7/27/2007 9:46:40 PM
Author: echelon6
hmmm Very interesting, thanks all. Its interesting that Strm said all the best stones do have it, because I''ve seen many that dont (see link).
I''ve looked at some other diamonds held by WF (so that their idealscope images are directly comparable since its the same scope used each time) and I noticed that some diamonds don''t have this red-grey table area? (around 1 in 5 in my experience)
e.g. one of the best I''ve seen: http://www.whiteflash.com/hearts_arrows/A-Cut-Above-H-A-cut-diamond-66400.htm# - and its stats are great too - I have ''number envy'' of this stone!
Maybe its just a case of which side has the greener grass, but I always tend to notice that Sold stones tend to be of very high quality, even relative to the ACA standard.
That one has a lot less intense backlighting, put it with the same backlighting and it will look similar except for the effects of the mild painting in the second.Date: 7/27/2007 9:46:40 PM
Author: echelon6
e.g. one of the best I've seen: http://www.whiteflash.com/hearts_arrows/A-Cut-Above-H-A-cut-diamond-66400.htm# - and its stats are great too - I have 'number envy' of this stone!
agree.Date: 7/27/2007 6:20:17 PM
Author: JohnQuixote
The angles are 40.8/34.8. What you’re seeing is a result of the current setup’s backlighting.
Date: 7/27/2007 11:42:18 PM
Author: echelon6
Strm, I have a long way to go before I can guess cp angles by just looking at their IS image
nope, Brian''s preferred combo is slightly different than tolk.Date: 7/28/2007 2:36:11 AM
Author: echelon6
Yeah I noticed that about ACAs, I never quite understood why ACAs tend to average 34.8 / 40.8 when Tolkowsky''s crown is 34.5 (iirc)...
Gives me the impression all the TIC ACAs have been sold