What do you think of 34.3 crown angle and 40.6 pavilio angle?

[diamondnewbieny]

Hello all,

I hope to get some input on what you think about these numbers? I know lot of people on here like the combo of 34.5 crown angle and 40.8 pavilion angle. Will 34.3 produce less fire? I don’t see the number combo like my diamond often, and the depth of my diamond is on the low side 60.8. Base on what I see here, Some people like it around 61.5?

Ok here is my diamond numbers. Let me know what you think.

Thanks in advance.

 

[flyingpig]

This is a bad side effect of being a PS member.
This is a symptom of analysis paralysis and you should quit PS for a few days.

 

[diamondnewbieny]

This is a bad side effect of being a PS member.
This is a symptom of analysis paralysis and you should quit PS for a few days.

I am literally laughing out loud, and my son who is 13months old laying next to me looked at me like I am crazy.

 

[TreeScientist]

There is absolutely nothing to worry about if the diamond has a TRUE 40.6 PA. The problem arises with GIA rounding of PA and unsymmetrical pavilion mains in diamonds that are not well cut. In such cases, one or multiple of the pavilion mains may drop below 40.45, which can result in obstruction issues. See my post on page 3 of this thread (don't feel like re-typing a novel):
https://www.pricescope.com/communit...ne-has-obstruction.245420/page-3#post-4466289

This is an AGS stone, so the PA is rounded to the nearest .1 instead of the nearest .2. Along with the symmetry of the ACA cut, it is highly unlikely that any of the pavilion mains would drop below 40.45.

34.3 is a slightly shallow CA for 40.6 PA, but with the small table of 55%, you'll still get plenty of fire as there is plenty of crown height in this diamond.

Nothing to worry about. As @flyingpig said, this is a case of PS-induced analysis paralysis.

 

[flyingpig]

34.3 is a slightly shallow CA for 40.6 PA, but with the small table of 55%, you'll still get plenty of fire as there is plenty of crown height in this diamond.

This!!

In addition, when you combine 40.6 PA with 76 LG%, you should be able to see well defined fat and long arrows that flash and sizzle under certain conditions. Chunky light reflections from a 2.5 carat diamond should be spectacular.

 

[diamondnewbieny]

There is absolutely nothing to worry about if the diamond has a TRUE 40.6 PA. The problem arises with GIA rounding of PA and unsymmetrical pavilion mains in diamonds that are not well cut. In such cases, one or multiple of the pavilion mains may drop below 40.45, which can result in obstruction issues. See my post on page 3 of this thread (don't feel like re-typing a novel):
https://www.pricescope.com/communit...ne-has-obstruction.245420/page-3#post-4466289

This is an AGS stone, so the PA is rounded to the nearest .1 instead of the nearest .2. Along with the symmetry of the ACA cut, it is highly unlikely that any of the pavilion mains would drop below 40.45.

34.3 is a slightly shallow CA for 40.6 PA, but with the small table of 55%, you'll still get plenty of fire as there is plenty of crown height in this diamond.

Nothing to worry about. As @flyingpig said, this is a case of PS-induced analysis paralysis.

Thanks for your explanation! My diamond pavilion depth is 42.8, so it’s a true 40.6 pavilion angle.

Thanks for putting my worries aside. I guess I could understand why people pick 40.5 pavilion angle just to be safe and not have to worry.

 

[diamondnewbieny]

This!!

In addition, when you combine 40.6 PA with 76 LG%, you should be able to see well defined fat and long arrows that flash and sizzle under certain conditions. Chunky light reflections from a 2.5 carat diamond should be spectacular.

Yes I love how sharp and clear the arrows are. I can see all of the arrows in shades of white, but I have yet to be able to see the arrows turn all black like some of the pictures I see here.

 

[flyingpig]

Yes I love how sharp and clear the arrows are. I can see all of the arrows in shades of white, but I have yet to be able to see the arrows turn all black like some of the pictures I see here.

You will never see the arrows turn all black, unless you apply military camo black paint on your face.
I am looking at the photos from your previous thread. I don't think fully understand how each part of your diamond reflects light.
In this photo, you mentioned "In direct sun light and turned dark"
No, the diamond does not turn black in direct sunlight. It turns dark because the diamond is facing you, car seat, and car ceiling, and you are seeing the reflection of them, which are not significant light sources. This is a common misunderstanding. Image your diamond as a mirror. If you are holding in a mirror in that position and angle, would you see bright sky and sunlight, or yourself and car ceiling?

Sunlight is probably coming from your left/behind. If you tilt the stone to the left, would you see a reflection of the sunlight. Yes, as you did.


I think you are a bit worried that the diamond is not performing as you imagined. It is all about light. Play with your diamond and light sources (and different angles and distances). It takes time.

And yes, a diamond can turn blue under a blue sky. Next time you go to a forest, it will turn green.

https://www.pricescope.com/communit...light-performance-diamond-photography.227610/
https://www.pricescope.com/community/threads/dyi-aset-nerdy-stuff-ver-2-0.234343/

 

[Dancing Fire]

Ok here is my diamond numbers. Let me know what you think.

Thanks in advance.

That is a very nice stone!

 

[Dancing Fire]

Sunlight is probably coming from your left/behind.

I thought that's where the sun don't shine...

 

[bmfang]

I thought that's where the sun don't shine...

Bazinga!
You’re on fire today @Dancing Fire