Prolly stupid ? but does the brilliance or light/fire return of a diamond...

[mlealexrln]

affected by its setting (ie. low-set diamond vs. cathedral setting)? Thanks

Amy

 

[Maisie]

I would say no - IF its a well cut diamond. The sparkle comes from light return and if its well cut it will be reflected back up through the top of the stone.... Like this:

 

[Garry H (Cut Nut)]

Dirt and grease on the pavilion or bottom is more of a problem.
Well cut diamonds have minimal see out the bottom window effect.
But in general an open setting willl allow a bit more like than a fully rubbed over and enclosed setting.
But the fully rubbed over usually allows you better acccess to clean the pavilion. Some prongs touch the diamond pavilion all the way down - the dirt build up is then really impossible to clean out and the diamond will look dull.

 

[Garry H (Cut Nut)]

Date: 2/13/2008 2:50:12 PM
Author: Maisie
I would say no - IF its a well cut diamond. The sparkle comes from light return and if its well cut it will be reflected back up through the top of the stone.... Like this:

I feel ill when I see those little ray path sketches.
The people who make them have absolutely no idea how silly they are maisie. The well cut stone would actually be the worst looking diamond you could ever see. The other two you will never ever find in rounds because they are way shallower and deeper than anything ever cut in a round.

 

[Maisie]

Well thats me embarrassed for the rest of the day

 

[strmrdr]

Date: 2/13/2008 2:53:39 PM
Author: Garry H (Cut Nut)

Date: 2/13/2008 2:50:12 PM
Author: Maisie
I would say no - IF its a well cut diamond. The sparkle comes from light return and if its well cut it will be reflected back up through the top of the stone.... Like this:

I feel ill when I see those little ray path sketches.
The people who make them have absolutely no idea how silly they are maisie. The well cut stone would actually be the worst looking diamond you could ever see. The other two you will never ever find in rounds because they are way shallower and deeper than anything ever cut in a round.

also false advertising, even the best cut diamond will send light out the bottom...

 

[Cleo]

Garry, you meanie! There was me thinking you look quite hot in your photo! LOL!

I think Maisie''s images were purely to illustrate the point the light returned from a diamond is (mainly) from light entering the top of the stone.

I''m sure no-one really expects to see stones cut in those exact proportions!

Obviously the proportions in the diagrams are hugely exaggerated (in the manner of a physics lesson illustration) simply to make the point about how the light is refracted differently in each example.

They might be visually offensive to an expert such as yourself, but to a lay-person they do a pretty good job in helping to get the physics across.

x x x

PS. *Hugs Maisie*

 

[strmrdr]

42 degree deep pavilion

 

[strmrdr]

40degree shallow sends less light out the bottom for that particular point.

 

[strmrdr]

40 degree pavilion aset white, white is leakage...

 

[strmrdr]

here is a pancake cut like the shallow in the diagram.

 

[strmrdr]

aset white for the pancake
Blue is bigger than white in the picture...
obstruction is larger then leakage...

 

[Garry H (Cut Nut)]

Oho- sorry Maisie

Date: 2/13/2008 2:55:40 PM
Author: Maisie
Well thats me embarrassed for the rest of the day

It is not you that should be embarrassed - it is the people that did the graphic

 

[Garry H (Cut Nut)]

Date: 2/13/2008 3:10:32 PM
Author: Cleo
Garry, you meanie! There was me thinking you look quite hot in your photo! LOL!

I think Maisie''s images were purely to illustrate the point the light returned from a diamond is (mainly) from light entering the top of the stone.

I''m sure no-one really expects to see stones cut in those exact proportions!

Obviously the proportions in the diagrams are hugely exaggerated (in the manner of a physics lesson illustration) simply to make the point about how the light is refracted differently in each example.

They might be visually offensive to an expert such as yourself, but to a lay-person they do a pretty good job in helping to get the physics across.

x x x

PS. *Hugs Maisie*

Actually Cleo they do everyone a diservice - they find their way into training material, and make people think the wrong way. We talk about the best pav angle as being 40.6 or 40.99

those charts need to be under 24.5 for the shallow eg and over 53 for the deep. The center example is by definition 45 degrees and is a nail head (you block all the light entering and leaving the table).

They are bad and stoopid.

 

[mlealexrln]

Wow, I''m glad I asked the question--you''re so right, strmrdr and Garry those light ray path sketches are etched in my brain

!! Thanks for clarifying the info

.

Amy

 

[Maisie]

Date: 2/13/2008 4:17:41 PM
Author: Garry H (Cut Nut)
Oho- sorry Maisie

Date: 2/13/2008 2:55:40 PM
Author: Maisie
Well thats me embarrassed for the rest of the day

It is not you that should be embarrassed - it is the people that did the graphic

 

[Maisie]

Date: 2/13/2008 3:10:32 PM
Author: Cleo
Garry, you meanie! There was me thinking you look quite hot in your photo! LOL!

I think Maisie''s images were purely to illustrate the point the light returned from a diamond is (mainly) from light entering the top of the stone.

I''m sure no-one really expects to see stones cut in those exact proportions!

Obviously the proportions in the diagrams are hugely exaggerated (in the manner of a physics lesson illustration) simply to make the point about how the light is refracted differently in each example.

They might be visually offensive to an expert such as yourself, but to a lay-person they do a pretty good job in helping to get the physics across.

x x x

PS. *Hugs Maisie*

Thank you sweetie xx

 

[danny0927]

*****tries really hard to resist*****

diamond nerds

 

[dmus]

I''m a little slow but love your conversations. I''m not sure I heard the answer. Is the light performance adversely affected by a low setting versus a cathedral? Hope I get a yes or no answer, but I''m sure I''ll here more. Thanks. Cleo - your right on. The picture is for idiots such as myself.


My wife just said " Don''t you have something better to do on Valentine''s Day!"

 

[Garry H (Cut Nut)]

Date: 2/14/2008 7:46:35 PM
Author: dmus
Is the light performance adversely affected by a low setting versus a cathedral?

Sorry if I took it off topic. Thisd is what i wrote above

Dirt and grease on the pavilion or bottom is more of a problem.
Well cut diamonds have minimal see out the bottom window effect.
But in general an open setting willl allow a bit more light in than a fully rubbed over and enclosed setting.
But the fully rubbed over usually allows you better acccess to clean the pavilion. Some prongs touch the diamond pavilion all the way down - the dirt build up is then really impossible to clean out and the diamond will look dull.

That is not yes or no.

Yes a really high girdle exposed to chipping 3 or 4 prong narrow unsafe setting lets more light in and a badly cut diamond can look quite nice.

 

[mlealexrln]

style="WIDTH: 99%; HEIGHT: 86px">Date: 2/14/2008 11:19:51 PM
Author: Garry H (Cut Nut)

Yes a really high girdle exposed to chipping 3 or 4 prong narrow unsafe setting lets more light in and a badly cut diamond can look quite nice.

Garry, could you maybe give me an example of this please?

Thanks,
Amy

 

[Maisie]

..

 

[strmrdr]

hmm wish I could find a picture of the setting I''m thinking off.
They used too be very popular until they got destroyed and diamonds starting chipping.
They were trellis settings where the center stone was about 3x as high as the 2 sides.
They were very popular about 10-15 years ago...
I cant find a pic online.

 

[Garry H (Cut Nut)]

Date: 2/15/2008 1:11:29 AM
Author: mlealexrln

style="WIDTH: 99%; HEIGHT: 86px">Date: 2/14/2008 11:19:51 PM
Author: Garry H (Cut Nut)

Yes a really high girdle exposed to chipping 3 or 4 prong narrow unsafe setting lets more light in and a badly cut diamond can look quite nice.

Garry, could you maybe give me an example of this please?

Thanks,
Amy

This one has fat prongs, so it is a little protected. But it will allowa lot of light into the pavilion
http://z.about.com/d/jewelry/1/0/P/4/sun_highprong_gpb.jpg