Opinions- Diamond details - it's this a good cut for fire & brilliance?

[AJPIrish]

New here. Your advice on the diamond I purchased would be much appreciated. It's GIA certified diamond with the following measurements. Do you think it will be a good cut for fire and brilliance?

(Maybe the pavilion angle is 0.1° less than Ideal but other measures appear Ideal yes/no?)

Carat: 1.4
Colour: D
Clarity: VVS 1
Cut Grade: Ideal
Measurement: 7.15-7.20mm x 4.39 mm
Table: 57%
Depth: 61.2%
Girdle Thickness: Medium
Crown Angle: 34.3°
Crown Height: 15%
Pavilion Angle: 40.5°
Pavilion Height: 42.5%
Cutlet: Pointed
Polish: Excellent
Symmetry: Excellent
Flouresence: None

 

[lulu_ma]

Do you have a vid you can share? Unless you or your partner are super color sensitive you could broaden your search to include E & F color stones.

This stone falls outside of even GIA xxx.

 

[tyty333]

For Fire, we usually recommend a higher crown (35ish) which takes a lower pavilion 40.6.

This may be a nice stone (need pics, video, aset, etc) but its not primarily geared toward fire.

BTW...the crown angle and pavilion angle need to work together. Higher crown needs lower
pavilion and vice versa.

Do you have a link to this stone? Put it on hold first if you like it.

 

[AJPIrish]

Thanks for this response. Please can you explain the graph? The measurements are considered IDEAL...I'm not sure which measurements you think fall outside this range? Attached is a basic video...doesn't show much.

 

[lulu_ma]

No vid attached. You have to post a vid link through Youtube or Imgur or Vimeo. You can upload vids directly to Pricescope.

The crown and pavilion angle combo isn’t ideal.

 

[AJPIrish]

Thanks for your feedback. I'd need a explanation as to why a crown angle of 34.3 & pavilion angle of 40.5 isn't considered near ideal rather than statement only (genuinely curious, not disagreeing).

All info I've researched tells me its really good but I'm very interested in finding out why your experience tells you it isn't. I'm a novice so if you can give me a reference or source for better info to reference I'd appreciate it.

"The range of acceptable crown angles is 34 – 35 degrees and the range of acceptable pavilion angles is 40.5 – 41 degrees. The ideal CA/PA is not surprisingly half way in between the acceptable range at 34.5/40.75 degrees"

 

[lulu_ma]

Real stones with similar angles:

 

[tyty333]

It all has to do with how the light bounces around when it hits the facets. You want the angles to make it bounce and return
back through the top of the stone to your eye.

Maybe this will help.

Diamond Proportions

The physics of light-behavior within a diamond are reliably consistent, which means proportions measurements can be useful.

www.pricescope.com

Edit...can you post the report GIA?

Who said that it was ideal? The vendor?

 

[lulu_ma]

Versus a super ideal



This video may help:

 

[Kim N]

We typically recommend pavilion angles of 40.6-40.9. If any of the pavilion mains fall below around 40.45, the diamond will have some unwanted obstruction. The pavilion angle is an average, so with 40.5, it is likely that some of the mains will go below 40.45.