Stephan
Ideal_Rock
- Joined
- Feb 13, 2003
- Messages
- 2,917
I don''t think so.Date: 4/23/2009 6:30:55 PM
Author: strmrdr
The entire idea is not correct by themselves lower and upper angles mean nothing and even relative to each other mean little.
Not only the middle but also the perimeter of the diamond should be alive (fire + light return), that makes a diamond look big.
I totally agree.Date: 4/23/2009 6:30:55 PM
Author: strmrdr
For example lower angle and length has to be considered against table size and crown height(CA is not 100% correct for this but can be used) not the upper girdle angle.
For every table size and crown height there is a different set of lowers that are optimal.
Then once that is done you have to balance them against the mains to see if they are practical(min painting and digging)
Note that more than minimal painting or digging out will be mentioned on the GIA report.
I still agreeDate: 4/23/2009 6:30:55 PM
Author: strmrdr
The upper girdle angle has to be balanced against the lowers, mains,CH, CA, and table.
You should not say bad, but imprecise.Date: 4/23/2009 6:30:55 PM
Author: strmrdr
Even if you were correct trying to calculate it from even non-gia rounded numbers is bad data.
Yet we can''t do better and the data I used is the best we can do if GIA doesn''t mention painting/digging.
Karl,
I know you had a diamond cut to your design.
I also know you bought Diamond Calc.
I respect your talents in matter of mathematics.
But I don''t know how many round brilliants you saw in real life.
And how many types of round brilliants.
Because if you saw 500 H&A''s, it only will tell you a part of the story.
As you told, till now Diamond Calc is not able to evaluate fire properly.
Diamond Calc won''t tell you if the color you see in the picture will be noticed as a big intense flash from the other side of the street or if it will be weak and only noticed from you when staring at your ring from a 25 cm distance.
I think Diamond Calc is interesting to estimate patterns due to reflections, to measure light return, but flashes of fire that occult a diamond because they are so strong is something Diamond Calc developers have to work on.
I really don''t want to aggress you, the fact is you aggress people by using words as "nonsense". When I say "I prefer" you say "You are wrong". When I say "I think that" you say "The truth is that".
Karl,
When you want, let your computer home and come to Belgium, my country.
I''ll show you Antwerp, it''s a place where you can look at diamonds from 10AM to 6PM every day but Sunday.
Karl you are great but a little humility could suit you.
I don''t know what time it is but here it''s time to go to bed.
Now you have plenty of time to reply.