Close to Buying! How Do These Proportions Look To You?

[La Jolla]

Hi All,
I''m close to buying this round brilliant and wanted to know if anyone had an opinion on its proportions. I unfortunately don’t have images for it. Is the crown angle for example a bit shallow? Or anything else.
GIA cut grade: Excellent
Depth: 62.0%
Table: 56%
Crown Angle: 33.5°
Crown Height: 14.5%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star length: 50%
Lower Half: 80%
No culet, medium to slightly thick girdle

 

[stone-cold11]

Looks promising.

33.5 degree is on the small side of the crown angle, so might be more bright and less fire from the diamond, but still in the near tolk proportion.

 

[Lorelei]

Date: 9/24/2009 8:44:48 PM
Author:La Jolla
Hi All,
I''m close to buying this round brilliant and wanted to know if anyone had an opinion on its proportions. I unfortunately don’t have images for it. Is the crown angle for example a bit shallow? Or anything else.
GIA cut grade: Excellent
Depth: 62.0%
Table: 56%
Crown Angle: 33.5°
Crown Height: 14.5%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star length: 50%
Lower Half: 80%
No culet, medium to slightly thick girdle

The diamond has definite potential, the crown angle isn''t really shallow at all especially by non PS standards, sometimes a shallower crown angle can gear a diamond towards showing more white light or brilliance than fire but in this case it depends as the crown is barely on the shallower side. An Idealscope image would be the next step.

 

[La Jolla]

Is there a way for me to get an Ideal-Scope image other than from the vendor? I live in DC, if that''s any help. The stone comes with a 30-day money back guarantee, so I''ll have some time to look at it once it arrives. But all I have is a 10X loupe.

 

[stone-cold11]

You can buy one from here http://www.ideal-scope.com/cart_order.asp

Or find an Independent appraiser with an ASET/IS scope to do it for you for your appraisal.https://www.pricescope.com/appr_list.aspx

 

[Todd Gray]

Date: 9/25/2009 8:04:06 AM
Author: La Jolla
Is there a way for me to get an Ideal-Scope image other than from the vendor? I live in DC, if that''s any help. The stone comes with a 30-day money back guarantee, so I''ll have some time to look at it once it arrives. But all I have is a 10X loupe.

Many of the independent Gemologists listed within the Resources / Appraisers section of Price Scope have the various scopes (Ideal Scope, ASET, Gems Fantasy) and can provide you with images as part of the evaluation process.

 

[La Jolla]

Thanks Todd, Stone-cold11 and Lorelei for the feedback and advice. I suppose I could get a beginner Ideal-Scope for not much money, but then I’d have to consider the learning curve required to use it and photograph the image, versus the fact that I''m just buying one diamond for now.

Looking for an appraiser might be a better route. I do notice that, on occasion, someone on Rocky Talky posts a simulated Ideal-Scope image of a diamond based on its proportions. Is that all software-based?

I found it interesting that both Stone-cold11 and Lorelei felt that, on account of the crown angle, the stone may show more brilliance and less fire. The HCA puts it in the "Within the Tolkowski Ideal Cut (TIC) range" rather than the BIC or FIC category, TIC implying that it may have a balance between brilliance and fire.

This is all incredibly fascinating.

Planning on purchasing it this weekend, with 30 days to evaluate it. Will keep you posted. Thanx.

 

[stone-cold11]

It is a trend, there is not sudden cut off where a stone suddenly becomes a brilliant cut or fiery cut. A shallower crown angle tends to be cut more towards brilliance while a steeper crown angle tends toward fire.

Yap, the simulated IS/ASET image are software based generated with the exact scan of a stone and then simulated with a software, Diamcalc. The free viewer version is the GemAdviser and reads the a .gem file. You can find examples of this files from GOG, HPD stones.

 

[Lorelei]

Date: 9/25/2009 11:01:23 PM
Author: La Jolla
Thanks Todd, Stone-cold11 and Lorelei for the feedback and advice. I suppose I could get a beginner Ideal-Scope for not much money, but then I’d have to consider the learning curve required to use it and photograph the image, versus the fact that I'm just buying one diamond for now.

Looking for an appraiser might be a better route. I do notice that, on occasion, someone on Rocky Talky posts a simulated Ideal-Scope image of a diamond based on its proportions. Is that all software-based?

I found it interesting that both Stone-cold11 and Lorelei felt that, on account of the crown angle, the stone may show more brilliance and less fire. The HCA puts it in the 'Within the Tolkowski Ideal Cut (TIC) range' rather than the BIC or FIC category, TIC implying that it may have a balance between brilliance and fire.

This is all incredibly fascinating.

Planning on purchasing it this weekend, with 30 days to evaluate it. Will keep you posted. Thanx.

Date: 9/25/2009 4:20:24 AM
Author: Lorelei





The diamond has definite potential, the crown angle isn't really shallow at all especially by non PS standards, sometimes a shallower crown angle can gear a diamond towards showing more white light or brilliance than fire but in this case it depends as the crown is barely on the shallower side. An Idealscope image would be the next step.

Actually I said it depends ( see above) as the crown is barely shallow in this case and in the non PS world would not be considered shallow at all from what I hear. If the crown angle was
Also with the computer generated images the actual IS and ASET are preferable.

 

[La Jolla]

"Actually I said it depends (see above) as the crown is barely shallow in this case and in the non PS world would not be considered shallow at all from what I hear. If the crown angle was <33 deg then that is getting more towards the shallow zone, also it very much depends on all the proportions working together too."

Thanks for the correction, Lorelei. It was Stone-Cold11''s perspective.

 

[Lorelei]

Date: 9/26/2009 9:26:24 AM
Author: La Jolla
'Actually I said it depends (see above) as the crown is barely shallow in this case and in the non PS world would not be considered shallow at all from what I hear. If the crown angle was
Thanks for the correction, Lorelei. It was Stone-Cold11's perspective.

Ok, just wanted to make sure!