Feedback on 2.30ct H VS2 XXX Diamond (GIA report included)

[oloap]

Hello,

I'd like to pick your brain about this tone: what's your take based on GIA reports below?

http://www.gia.edu/cs/Satellite?reportno=3175765206&childpagename=GIA%2FPage%2FReportCheck&pagename=GIA%2FDispatcher&c=Page&cid=1355954554547

thanks!

 

[Gypsy]

Re: Feedback on 2.30ct H VS2 XXX Diamond (GIA report include

Nope. Steep deep.

Read below, click on the links, and study up:

The entire purpose of faceting a diamond is to reflect light.
How well or how poorly a diamond does this determines how beautiful it is.
How well a diamond performs is determined by the angles and cutting. This is why we say cut is king.
No other factor: not color, not clarity has as much of an impact on the appearance of a diamond as its cut. An ideal H will out white a poorly cut F. And GIA Ex is not enough. And you must stick to GIA and AGS only. EGL is a bad option: [URL='https://www.pricescope.com/community/threads/egl-certification-are-any-of-them-ok.142863/']https://www.pricescope.com/community/threads/egl-certification-are-any-of-them-ok.142863/[/URL]
So how to we ensure that we have the right angles and cutting to get the light performance we want?
https://www.pricescope.com/wiki/diamonds/diamond-cut
Well one method is to start with a GIA Ex, and then apply the HCA to it. YOU DO NOT USE HCA for AGS0 stones.
https://www.pricescope.com/wiki/diamonds/holloway-cut-advisor
The HCA is a rejection tool. Not a selection tool. It uses 4 data points to make a rudimentary call on how the diamond may perform.
If the diamond passes then you know that you are in the right zone in terms of angles for light performance. Under 2 is a pass. Under 2.5-2.1 is a maybe. 2.6 and over is a no. No score 2 and under is better than any other.
Is that enough? Not really.
So what you need is a way to check actual light performance of your actual stone.
That's what an idealscope image does. https://www.pricescope.com/wiki/diamonds/firescope-idealscope
It shows you how and wear your diamond is reflecting light, how well it is going at it, and where you are losing light return. That is why you won't see us recommending Blue Nile, as they do not provide idealscope images for their diamonds. BGD, James Allen, GOG, HPD, ERD and WF do.

The Idealscope is the 'selection tool'. Not the HCA.
So yes, with a GIA stone you need the idealscope images. Or you can buy an idealscope yourself and take it in to the jeweler you are working with to check the stones yourself. Or if you have a good return policy (full refund minimum 7 days) then you can buy the idealscope, buy the stone, and do it at home.


Now if you want to skip all that... stick to AGS0 stones and then all you have to do is pick color and clarity and you know you have a great performing diamond. Because AGS has already done the checking for you. That's why they trade at a premium.

 

[Lorelei]

Re: Feedback on 2.30ct H VS2 XXX Diamond (GIA report include

Hello,

I'd like to pick your brain about this tone: what's your take based on GIA reports below?

http://www.gia.edu/cs/Satellite?reportno=3175765206&childpagename=GIA%2FPage%2FReportCheck&pagename=GIA%2FDispatcher&c=Page&cid=1355954554547

thanks!

Hi oloap,

I would pass on this diamond from the info we have, it's what we call a steep/deep angled diamond. This means in basic terms that the crown and pavilion angles are respectively too steep and deep to work well together, light leakage is often the result, reducing the sparkle and beauty of the stone.

If you look at this cheat sheet I made some years back with the help of expert John Pollard, this will help get you within the ballpark of the better cut diamonds out there.

depth - 60 - 62% - although my personal preference is to allow up to 62.4%
table - 54- 57%
crown angle - 34- 35 degrees
pavilion angle - 40.6- 41 degrees
girdle - avoid extremes, look for thin to slightly thick, thin to medium etc
polish and symmetry - very good and above

note - with crown and pavilion angles at the shallower ends ( CA 34- PA 40.6) and steeper ( CA 35- PA 41) check to make sure these angles complement in that particular diamond - own eyes, taste, preference, Idealscope, trusted vendor input - check as appropriate!

From expert John Pollard.

''As the above implies, configurations depend on each other. A little give here can still work with a little take there.

With that said, here''s a "Cliff''s Notes" for staying near Tolkowsky/ideal angles with GIA reports (their numbers are rounded): A crown angle of 34.0, 34.5 or 35.0 is usually safe with a 40.8 pavilion angle. If pavilion angle = 40.6 lean toward a 34.5-35.0 crown. If pavilion angle = 41 lean toward a 34.0-34.5 crown.

GIA "EX" in cut is great at its heart, but it ranges a bit wider than some people prefer, particularly in deep combinations (pavilion > 41 with crown > 35).''

Also, if you would like some assistance finding a diamond, post your budget and other requirements here and we can see what is available.

 

[luvdajules]

Re: Feedback on 2.30ct H VS2 XXX Diamond (GIA report include

Hi OP, that stone has an HCA =4.8 (Good, only if price is only consideration). You probably can do much better and still at a great price, just takes a little work, but very worth it. Lorelei gave you a great cheat sheet to work from, do you know how to use and interpret the HCA tool? That will help you focus on in the stones that deserve further investigation (ASET or idealscope). Good luck with your hunt!

 

[Andelain]

Re: Feedback on 2.30ct H VS2 XXX Diamond (GIA report include

 

[Lorelei]

Re: Feedback on 2.30ct H VS2 XXX Diamond (GIA report include