Fleimstaler
Rough_Rock
- Joined
- Jan 2, 2005
- Messages
- 17
Date: 1/6/2005 4:44:15 PM
Author: stretch4
Gentlemen????
Date: 1/6/2005 3:43:32 PM
Author:Fleimstaler
Hi gentlemen.
I tried to find comments on the G & G article on diamond cut but I found none. Is there any comment on this topic somewhere on pricescope.com?
Thanks and Rgds.
Fleimstaler
DCLR in general decreases as the pavilion angle increases.
Fleimstaler,Date: 1/7/2005 7:49:30 AM
Author: Fleimstaler
By reading the article on the Fall 2004 issue of G & G, I had the following impresisons:
The new GIA diamond cut grading system is based upon:
1. Proprtions
2. Okuda'' red light reflection principle
3. Gemprint techonology
Rgds.
Fleimstaler
am i stuck in the twilight zone? (the answer my still be yes) what is the date of this educational event in tucson? and where can i get more information about it? thanks!Date: 1/7/2005 1:42:17 PM
Author: oldminer
ImaGem will not be on display in Tucson. I would expect future major shows will see ImaGem on display, but I don''t know when they will begin this aspect of their plan.
There is a major diamond cut educational event hosted by the Accredited Gemologists Association on 1/2/05 at the Tucson University Park Marriott and I will be there hopefully accompanied by Dr. Lalit Aggarwal, the inventor and principal of ImaGem. He or I may be part of the panel assembled for the day. Again, this is all lat minute manouvering and I''m not certain of the exact committment that is being formulated. POLITICS>>> This Accredited Gemologists event is bound to be one of their best ever. It is an excellent continuing eduction orgainzation than has never gotten the recognition it so well deserves. Attendance is open to all and the fee is nominal. considering the location, length of the day long event and the topic. Generally speaking, the members are among the friendliest folks in the gemology biz. Of course, there are exceptions to this rule........they know who they are.
Why is it my sick mind turns your thoughts into appraisal of the opposite sex thoughts Dave.Date: 1/7/2005 48:32 PM
Author: oldminer
Yes, I sort of stole the thread. I apologize (a little bit).....Please forgive me.
When one talks about beauty, or most beautiful, it remains an inherently subjective thing. There is no one set of parameters or measures that everyone would agree provides the ultimate beauty content. It is a series of results that give pretty much (subjectively) the best range of highly beautiful diamonds which converts to diamond grades for Light Behavior.
The results of the preliminary computer modeling for brilliance and fire were reported in Gems & Gemology (articles cited earlier and available at http://www.gia.edu/ gemsandgemology/27540/free_article_downloads.cfm). Comparison of those results to observations of actual diamonds in similar conditions allowed the researchers to refine these metrics. Further observation tests evaluating overall appearance — made by representatives from all levels of the diamond trade in controlled viewing environments — also confirmed that those two aspects alone were insufficient to predict the appearance of many diamonds.
Well, spot on... philosophy by the book. Who could disagree ?Date: 1/7/2005 6:46:49 PM
Author: Garry H (Cut Nut)
Rapaport has an article too - there are photo''s in the hard copy - but none on the website.
Here is an excerpt:
[...]
“Our initial observation tests revealed that, as we expected, our best brightness and fire metrics were able to predict specific observation results (i.e., brightness and fire), but they were not adequate to predict and evaluate a diamond’s overall cut appearance and quality,” wrote Moses and his colleagues.
Again, it seems that this technique of evaluating cut predates even Okuda''s microscope. To credit him with originating it ignores this.Date: 1/7/2005
Author: Fleimstaler
To my opinion it can be assesed by the Okuda red light reflections principle from which , the firescope, ideal scope, my instruments and so on derive.
Well... if only AGS0 proportions would look good, almost no one would like diamonds, no ? Narrow grades serve branding well, but there must be some good in a broader spectrum. At least IMO.Date: 1/8/2005 3:198 AM
Author: lostdog
But think about:
''Diamond manufacturers will be able to cut round brilliants to a wider range than the current norm and still achieve top-grade, great-looking diamonds.