Star Facets 65%

[Serg]

50%

 

[Serg]

65%

 

[Serg]

50%

 

[Serg]

Stephan,

First two images show Histograms (angle dispersion)*(Intensity of Beam) . I do not see big difference

lost two images are Histograms of angle dispersion . Yes diamond with bigger star facets has bigger dispersion

Looks what fire flashes could be more often but not bright

 

[Serg]

65%

 

[Stephan]

Serg,

Thank you so much for all the time you invest to answer my question.
This pictures are of a 40.75 PA - 34.5 CA right?
Can I ask you how it would work with a 40.8 PA - 33.7 CA and 80% lgf?
Thanks!

 

[Serg]

Date: 9/2/2008 4:49:33 PM
Author: QueenMum
Serg,

Thank you so much for all the time you invest to answer my question.
This pictures are of a 40.75 PA - 34.5 CA right?
Can I ask you how it would work with a 40.8 PA - 33.7 CA?
Thanks!

yes,
no. Time to sleep

 

[Stephan]

I wish you a good night.
Hope to read you tomorrow.

 

[strmrdr]

Interesting images.
As I thought it is the different angle of the upper girdles that is making the biggest difference not the actual star length.

 

[Stephan]

Date: 9/2/2008 4:49:33 PM
Author: QueenMum
Can I ask you how it would work with a 40.8 PA - 33.7 CA and 80% lgf?
Thanks!

With a 33.7 CA and a 55% table, the star could be 62% (upper girdle 42.15°) or 63% (upper girdle 42.38°).
I think such an upper girdle will work good with the pavilion main of 40.8 and the lgf of 80% (41.89°).

I guess that this one could look better, but correct me if I''m wrong.

In your example with a 34.5 CA, 65% star and a 55% table, the upper girdle is 43.75, perhaps a little bit too steep for the pavilion.

 

[Serg]

Date: 9/3/2008 7:57:20 AM
Author: QueenMum

Date: 9/2/2008 4:49:33 PM
Author: QueenMum
Can I ask you how it would work with a 40.8 PA - 33.7 CA and 80% lgf?
Thanks!

With a 33.7 CA and a 55% table, the star could be 62% (upper girdle 42.15°) or 63% (upper girdle 42.38°).
I think such an upper girdle will work good with the pavilion main of 40.8 and the lgf of 80% (41.89°).

I guess that this one could look better, but correct me if I''m wrong.

In your example with a 34.5 CA, 65% star and a 55% table, the upper girdle is 43.75, perhaps a little bit too steep for the pavilion.

re:Can I ask you how it would work with a 40.8 PA - 33.7 CA and 80%

result is very similar

see for Star 65%

 

[Serg]

Stephan,
re:With a 33.7 CA and a 55% table, the star could be 62% (upper girdle 42.15°) or 63% (upper girdle 42.38°).

60% is better for P40.8Cr33.7T55Lgfl80

re: 62% (upper girdle 42.15°) or 63% (upper girdle 42.38°).

I see you have DC, in next 1-2 weeks you can create such images for any parameters. Please wait DC3.2

 

[Stephan]

Thank you Serg for your explanations!
60% stars seems to be good.

Date: 9/3/2008 10:43:14 AM
Author: Serg
I see you have DC, in next 1-2 weeks you can create such images for any parameters. Please wait DC3.2

Sorry, I don''t have DiamondCalc!

 

[Serg]

Date: 9/3/2008 10:49:32 AM
Author: QueenMum
Thank you Serg for your explanations!
60% stars seems to be good.

Date: 9/3/2008 10:43:14 AM
Author: Serg
I see you have DC, in next 1-2 weeks you can create such images for any parameters. Please wait DC3.2

Sorry, I don''t have DiamondCalc!

Stephan,
what did you use to calculate angles girdle facets?

 

[Stephan]

Date: 9/3/2008 10:54:47 AM
Author: Serg
Stephan,
what did you use to calculate angles girdle facets?

I used the information found in this document:
http://www.wtocd.be/Diamond/D_Articles/The Brilliant Cut.pdf

 

[strmrdr]

Date: 9/3/2008 10:49:32 AM
Author: QueenMum
Thank you Serg for your explanations!

60% stars seems to be good.

Date: 9/3/2008 10:43:14 AM

Author: Serg

I see you have DC, in next 1-2 weeks you can create such images for any parameters. Please wait DC3.2

Sorry, I don''t have DiamondCalc!

When DC3.2 is out we will do a thread on this and I will produce the images for you for different combinations.
I''m going to be doing so anyway as I study it so it isn''t that big a deal to save some and post them.

 

[Stephan]

Thank you Karl and Serg, this fascinates me!

 

[strmrdr]

Date: 9/3/2008 1:04:06 PM
Author: QueenMum
Thank you Karl and Serg, this fascinates me!

me too.
I am looking forward to playing with it.