Question regarding crown angles

[ShaniB]

Hi everyone,

First of all, thank you very much to all on this forum for your expertise and time you put into educating the rest of us know do not know as much about these stones. Your knowledge and enthusiasm is highly, highly appreciated.

I am looking at a diamond that is:
GIA
F color
1.7 ct
7.78 x 7.82 mm
SI1 - told by Martin at USA cert that it is a high SI1 more like a VS2
Cut / polish / symmetry all EX/EX/EX
Comments section of GIA grade has no comments
No Fluoro (which I am a tad disappointed in; I love look of icy blue diamonds)
HCA 0.7, scoring Excellent on all 4: light return/fire/scint/spread
Depth: 59.9%
Table: 58%
Crown: 33
Pavilion: 41
Price $16,500

Some things about me:
--I am color sensitive and I plan on putting the stone in a halo -- which to me is a little scary b/c when I go to b/m stores next to those tiny little melee to me most stones take on a kinda yellowish haze. I LOVE warm stones, but for this ring I want icy, no warmth. So, color needs to be high.
--However, I couldn't pick out an inclusion from a stone to save my life. Even with a loupe. So, to me an eye clean SI2 would be fine.
--If given a choice I'd probably pick a SI2/E color instead of a SI1/F color but seems hard to find SI2/ E eye clean w/ low HCA score.

Anyway, the stone is on hold and I asked for ASET images.

Was wondering if I should have concerns about the crown angle being so.... I dont' know... 33? Seems shallow.
Even before seeing the images, are there other concerns that anyone else have or questions I should be asking?

Thanks in advance!

 

[JulieN]

Can USA Cert get you a picture of it? It should be fine.

 

[TC1987]

[URL='https://www.pricescope.com/community/threads/33-crown-angle-41pavillion-angle.137943/']https://www.pricescope.com/community/threads/33-crown-angle-41pavillion-angle.137943/[/URL]
[URL='https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/']https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/[/URL]

There were some comments in those threads about "may be more toward brilliance than fire." That kind of goes with shallower 60/60 diamonds, but I don't think it's bad. Brilliance is what you see from across the room, hehe. But it may have a good balance of fire and brilliance, too.

 

[ShaniB]

Thank you both ! I learned that I cannot get images, but I will be able to see it in person, so I think I will do that...
Thanks again.

 

[Christina...]

Ask to see the stone in as many different lighting environments as possible. Also I would try to compare it to another with more traditionally ideal proportions to see if you notice a difference in the types of performance. It's difficult to find these lighting environments in a jewelry store, but perhaps they will let you take it into office lighting, near a window, or somewhere away from the special store lighting. If you like what you see when you view the diamond, I would make sure that there is a good return policy and then view the stone under these different types of lighting (home, work, car outside) to be sure that your happy with it.

 

[yssie]

Hi everyone,

First of all, thank you very much to all on this forum for your expertise and time you put into educating the rest of us know do not know as much about these stones. Your knowledge and enthusiasm is highly, highly appreciated.

I am looking at a diamond that is:
GIA
F color
1.7 ct
7.78 x 7.82 mm
SI1 - told by Martin at USA cert that it is a high SI1 more like a VS2
Cut / polish / symmetry all EX/EX/EX
Comments section of GIA grade has no comments
No Fluoro (which I am a tad disappointed in; I love look of icy blue diamonds)
HCA 0.7, scoring Excellent on all 4: light return/fire/scint/spread
Depth: 59.9%
Table: 58%
Crown: 33
Pavilion: 41
Price $16,500

Some things about me:
--I am color sensitive and I plan on putting the stone in a halo -- which to me is a little scary b/c when I go to b/m stores next to those tiny little melee to me most stones take on a kinda yellowish haze. I LOVE warm stones, but for this ring I want icy, no warmth. So, color needs to be high.
--However, I couldn't pick out an inclusion from a stone to save my life. Even with a loupe. So, to me an eye clean SI2 would be fine.
--If given a choice I'd probably pick a SI2/E color instead of a SI1/F color but seems hard to find SI2/ E eye clean w/ low HCA score.

Anyway, the stone is on hold and I asked for ASET images.

Was wondering if I should have concerns about the crown angle being so.... I dont' know... 33? Seems shallow.
Even before seeing the images, are there other concerns that anyone else have or questions I should be asking?

Thanks in advance!

Numbers are fine. There's a variety of proportions that can combine to yield a pretty stone - different flavour, but still objectively pretty. Numbers only tell us so much b/c of the averaging and rounding, as other posters have pointed out, so seeing it in-person is the way to go

the 58/33/41 combo is a great choice for someone who wants a larger stone, wants a dazzlingly white stone, and wants to downplay contrast between center and melee (that contrast is a function of both actual body colour and type of light return, which is ultimately determined by proportions - bigger stones w/ bigger facets and different proportions just play with light differently).

LGF? Date of report?

 

[Lula]

A 33 crown angle is not too low, especially when paired with a 41 crown pavilion angle -- it should be fine. I agree with Christina's advice to take a look at it in all lighting conditions, especially away from bright jewelry store lights. When you look at the stone, make sure it's got a pleasing (to your eye) mix of colored fire and white sparkle. It shouldn't have any dull or dead areas, and should look bright and lively. Some lighting conditions are more favorable to fire (spotlights) and some lighting conditions are more favorable to white sparkle (fluorescent) so that's why you need to look at it outside of the blinding jewelry store lights to get a fair impression of what the diamond will look like in "normal" lighting conditions.

 

[jz77]

https://www.pricescope.com/community/threads/33-crown-angle-41pavillion-angle.137943/
[URL='https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/']https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/[/URL]

There were some comments in those threads about "may be more toward brilliance than fire." That kind of goes with shallower 60/60 diamonds, but I don't think it's bad. Brilliance is what you see from across the room, hehe. But it may have a good balance of fire and brilliance, too.

How do you use the gem adviser program in that thread? Is it like some kind of simulation? I want to know if my 34/41 is good. Thanks

 

[Lula]

https://www.pricescope.com/community/threads/33-crown-angle-41pavillion-angle.137943/
[URL='https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/']https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/[/URL]

There were some comments in those threads about "may be more toward brilliance than fire." That kind of goes with shallower 60/60 diamonds, but I don't think it's bad. Brilliance is what you see from across the room, hehe. But it may have a good balance of fire and brilliance, too.

How do you use the gem adviser program in that thread? Is it like some kind of simulation? I want to know if my 34/41 is good.
Thanks

What is the lgf number on the GIA report? It should be a number between 75 and 85? That will give us more information about the stone you are considering.

I think gem advisor is a downloadable program that simulates diamond performance/appearance. You might be able to get a copy through Jon at Good Old Gold. I'm not sure, though.

 

[jz77]

https://www.pricescope.com/community/threads/33-crown-angle-41pavillion-angle.137943/
[URL='https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/']https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/[/URL]

There were some comments in those threads about "may be more toward brilliance than fire." That kind of goes with shallower 60/60 diamonds, but I don't think it's bad. Brilliance is what you see from across the room, hehe. But it may have a good balance of fire and brilliance, too.

How do you use the gem adviser program in that thread? Is it like some kind of simulation? I want to know if my 34/41 is good.
Thanks

What is the lgf number on the GIA report? It should be a number between 75 and 85? That will give us more information about the stone you are considering.

I think gem advisor is a downloadable program that simulates diamond performance/appearance. You might be able to get a copy through Jon at Good Old Gold. I'm not sure, though.

What is lgf number? I am not sure but these are the measurements:

Measurements: 6.48 - 6.50 x 3.97 mm
Carat Weight: 1.03 carat
Color Grade: F
Clarity Grade: VS2
Cut Grade: Excellent
PROPORTIONS

Depth: 61.2%
Table: 58%
Crown Angle: 34.0°
Crown Height: 14.0%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star Length: 50%
Lower Half: 80%
Girdle: Medium to Slightly Thick, Faceted (4.0%)
Culet: None
FINISH

Polish: Excellent
Symmetry: Excellent
Fluorescence: None

HCA score of 1.5

 

[Lula]

https://www.pricescope.com/community/threads/33-crown-angle-41pavillion-angle.137943/
[URL='https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/']https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/[/URL]

There were some comments in those threads about "may be more toward brilliance than fire." That kind of goes with shallower 60/60 diamonds, but I don't think it's bad. Brilliance is what you see from across the room, hehe. But it may have a good balance of fire and brilliance, too.

How do you use the gem adviser program in that thread? Is it like some kind of simulation? I want to know if my 34/41 is good.
Thanks

What is the lgf number on the GIA report? It should be a number between 75 and 85? That will give us more information about the stone you are considering.

I think gem advisor is a downloadable program that simulates diamond performance/appearance. You might be able to get a copy through Jon at Good Old Gold. I'm not sure, though.

What is lgf number? I am not sure but these are the measurements:

Measurements: 6.48 - 6.50 x 3.97 mm
Carat Weight: 1.03 carat
Color Grade: F
Clarity Grade: VS2
Cut Grade: Excellent
PROPORTIONS

Depth: 61.2%
Table: 58%
Crown Angle: 34.0°
Crown Height: 14.0%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star Length: 50%
Lower Half: 80% This is the lgf number -- sorry for the confusion. This number looks fine
Girdle: Medium to Slightly Thick, Faceted (4.0%)
Culet: None
FINISH

Polish: Excellent
Symmetry: Excellent
Fluorescence: None

HCA score of 1.5 -- An HCA score of under 2 is good, so no red flags here either -- looks like you found a nice diamond!

 

[jz77]

https://www.pricescope.com/community/threads/33-crown-angle-41pavillion-angle.137943/
[URL='https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/']https://www.pricescope.com/community/threads/62-table-good-crown-and-pav-angles-are-rhino.66581/[/URL]

There were some comments in those threads about "may be more toward brilliance than fire." That kind of goes with shallower 60/60 diamonds, but I don't think it's bad. Brilliance is what you see from across the room, hehe. But it may have a good balance of fire and brilliance, too.

How do you use the gem adviser program in that thread? Is it like some kind of simulation? I want to know if my 34/41 is good.
Thanks

What is the lgf number on the GIA report? It should be a number between 75 and 85? That will give us more information about the stone you are considering.

I think gem advisor is a downloadable program that simulates diamond performance/appearance. You might be able to get a copy through Jon at Good Old Gold. I'm not sure, though.

What is lgf number? I am not sure but these are the measurements:

Measurements: 6.48 - 6.50 x 3.97 mm
Carat Weight: 1.03 carat
Color Grade: F
Clarity Grade: VS2
Cut Grade: Excellent
PROPORTIONS

Depth: 61.2%
Table: 58%
Crown Angle: 34.0°
Crown Height: 14.0%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star Length: 50%
Lower Half: 80% This is the lgf number -- sorry for the confusion. This number looks fine
Girdle: Medium to Slightly Thick, Faceted (4.0%)
Culet: None
FINISH

Polish: Excellent
Symmetry: Excellent
Fluorescence: None

HCA score of 1.5 -- An HCA score of under 2 is good, so no red flags here either -- looks like you found a nice diamond!

haha thanks lula. I am now considering whether to buy an ACA 1.04 (also HCA 1.5) from WF with settings or from this Singapore store. Price will be about US$170 cheaper in Singapore. Decisions decisions! this is tough!