Is this diamond up to PS's standard? idealscope attached

[phale]

Please let me know if this diamond is up to PS standard Thanks

https://myapps.gia.edu/ReportCheckPortal/getReportData.do?&reportno=2136871903&weight=1.22

 

[04diamond<3]

Looks pretty good to me!

 

[Christina...]

It's likely a very bright stone . My personal preference would be for a stone with a slightly higher crown angle, but that's just personal preference.

 

[phale]

It's likely a very bright stone . My personal preference would be for a stone with a slightly higher crown angle, but that's just personal preference.

Thanks Christina for taking time to look at the numbers

does a higher crown angle stone give more fire? i'd like a stone with more fire

 

[phale]

Looks pretty good to me!

Thanks

 

[Christina...]

Typically a stone with a nice balance of both white and colored light return will have a crown angle of 34-35 and a pavilion angle of 40.5-40.9 or so. A FIC (fire-y ideal cut) generally has a taller crown and small table, with the crown angle being around 16% I believe, and table between 54-56 and a slightly shallower pavilion.

 

[phale]

I plugged the numbers in HCA and the fire factor comes back as Excellent...that's why I chose that particular diamond.

Are results on HCA from : light return, fire, scintillation reliable? and also what does this mean"Your own personal preference may be for a diamond with an HCA score of 1.5 more rather than one with a lower score of say 0.5." ?

 

[Bailey_Lou]

I checked the Holloway Cut Advisor for you and this diamond scored a .8, which is a great score. Also, the dimensions on the report are within the numbers that we like to use. Here's the cheat sheet for RB diamonds below. Also, the idealscope image you provided looks great.

Cheat Sheet for Round Brilliants:
Table of 54-57
Depth of 60-62.
Crown angle of 34-35.5
Pavilion angle of 40.6-41

 

[Lula]

I plugged the numbers in HCA and the fire factor comes back as Excellent...that's why I chose that particular diamond.

Are results on HCA from : light return, fire, scintillation reliable? and also what does this mean"Your own personal preference may be for a diamond with an HCA score of 1.5 more rather than one with a lower score of say 0.5." ?

There is nothing wrong with the crown height. Many people here prefer diamonds with small tables and higher crown heights. Others prefer more shallow diamonds with larger tables and lower crowns. This is what the "personal preference" statement is referring to. There are several different types or "flavors" of diamonds that score well on the HCA. Unless you've seen a lot of diamonds and know what to look for, you probably won't notice much difference in real life between a 33.5 crown and a 34 or 34.5 crown. GIA rounds its numbers, so the numbers you see on the report are all approximates anyway. The IS looks nice. Make sure you are buying from a place with a good return policy, just for peace of mind.

 

[04diamond<3]

There is nothing wrong with the crown height..

I agree. I really wouldn't worry about it. The numbers look good as does the IS.

 

[chrono]

IS looks good. Crown height is a personal preference once its light performance passes the test.

 

[John P]

does a higher crown angle stone give more fire? i'd like a stone with more fire

Not necessarily. It's all dependent on how the factors combine.

Given a robust pavilion angle...A 33.5 degree CA paired with a 63% table and 85% lower halves would be hard-pressed to eek-out fire (or some might say DCLR...any old-schoolers here recall what that acronym stands for?) Whereas a 33.5 degree CA paired with a 53% table and 73% lower halves could show quite a lot of dispersion - depending on cut-precision - but might suffer in the overall brightness category.

In generic terms the visibility of dispersion (given a robust pavilion) is often influenced by table and crown angle which combine to create crown height. It's further enhanced by (a) table+lower-half relationship and (b) especially details of cut-precision, which can create larger virtual facets.

RE this diamond: At 14.5% the crown height is right in the 'bullseye' of many diamonds recommended here. The lower halves are rounded to 75% on the report (I see them at 76-77%) which I find favorable for promoting dispersion in precisely cut diamonds.

 

[Christina...]

I plugged the numbers in HCA and the fire factor comes back as Excellent...that's why I chose that particular diamond.

Are results on HCA from : light return, fire, scintillation reliable? and also what does this mean"Your own personal preference may be for a diamond with an HCA score of 1.5 more rather than one with a lower score of say 0.5." ?

There is nothing wrong with the crown height. Many people here prefer diamonds with small tables and higher crown heights. Others prefer more shallow diamonds with larger tables and lower crowns. This is what the "personal preference" statement is referring to. There are several different types or "flavors" of diamonds that score well on the HCA. Unless you've seen a lot of diamonds and know what to look for, you probably won't notice much difference in real life between a 33.5 crown and a 34 or 34.5 crown. GIA rounds its numbers, so the numbers you see on the report are all approximates anyway. The IS looks nice. Make sure you are buying from a place with a good return policy, just for peace of mind.

Agreed!

 

[phale]

Thanks you all so much

@Lula: you inspired me, I almost went with the I clarity from Crafted by Infinity. I still adore their diamond. Maybe my next upgrade

@Chrono: I was curious to see your OEC then I fell in love with the flowery pattern. I am so torn between this RB and an OEC from JBEG. I bought this from Grace today: http://jewelsbyericagrace.smugmug.com/Jewelry/Rings-Antique-Vintage/142ct-Old-European-Cut-Diamond/23385747_MvVMLD#!i=1908490734&k=zhx37RC

and I made this thread: [URL='https://www.pricescope.com/community/threads/extremely-thin-girdle-tiffanys-oec-help.189449/']https://www.pricescope.com/community/threads/extremely-thin-girdle-tiffanys-oec-help.189449/[/URL]

Please give me some directions

@John Pollard: your first paragraph I went blank, like "huh?"...lol However I like your last paragraph. Thanks so much for your expert opinion. I really appreciate it.

@Christina, 04diamond, nbuenavent, Thanks for helping me