Any good

[ds1980]

Looking at this to go in pave twisted setting

Any thoughts appreciated.

http://www.jamesallen.com/loose-diamonds/round-cut/0.71-carat-i-color-si1-clarity-excellent-cut-sku-376648

 

[Gypsy]

It's a 60/60 and the pavilion angle is JUST within acceptable range. https://www.pricescope.com/wiki/diamonds/60-60-proportioned-diamond..

BUT it scores really poorly on the HCA at 3.7: https://www.pricescope.com/tools/hca And I can see leakage in the video.

So it's not a good choice. I'll look for a better choice for you. Is 2500 your budget?

Here's some basic information to get you started.
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.

 

[Gypsy]

If eyeclean this is a much better choice: http://www.jamesallen.com/loose-diamonds/round-cut/0.70-carat-i-color-si1-clarity-excellent-cut-sku-374451

Put on hold immediately (we get lurkers who steal) and ask for an Idealscope image. They will get you one within 5 business days.

Post it here and we'll tell you what we think. It should be a winner though.

 

[ds1980]

Thanks for help guys. It's a minefield isn't it? Someone else advised me on the previous diamond. The one gypsy advises looks hell of a lot worse than the other for inclusions with a chip or feather on the top? Just don't really understand what I'm trying to find or look at!?!? Yes I'm looking at about £2k sterling but a little more for the right stone possibly. I'll get it delivered in States and brought over to save me VAT.

 

[Gypsy]

The magnified pic is scary I know. The gemologist can tell you if it is eyeclean. Remember the diamond is smaller than a pencil eraser! If it is eyeclean you are good to go.

 

[Gypsy]

Person who advised you knows squat about diamond performance. The leakage is very clear in the video. If it was a JA sales rep I am unsurprised, lamentably

 

[ds1980]

Thanks. No it wasn't ja rep

I have placed it on hold. Was there anything else i needed to ask gemologist. It is eye clean apparently.

Do the gia characteristics mean anything etch channel twinning wisp?

They also mentioned this

http://www.jamesallen.com/loose-diamonds/round-cut/0.75-carat-i-color-vs1-clarity-excellent-cut-sku-380024?a_aid=dmnd1357&chan=x

I think that comes out at 1.8 on HCa if ive done it correctly. So much to learn!

 

[two_little_birds]

Thanks. No it wasn't ja rep

I have placed it on hold. Was there anything else i needed to ask gemologist. It is eye clean apparently.

Do the gia characteristics mean anything etch channel twinning wisp?

They also mentioned this

http://www.jamesallen.com/loose-diamonds/round-cut/0.75-carat-i-color-vs1-clarity-excellent-cut-sku-380024?a_aid=dmnd1357&chan=x

I think that comes out at 1.8 on HCa if ive done it correctly. So much to learn!

This one is much better, and yes it scores a 1.8 on the HCA. I would put it on hold ASAP and ask for an ideal-scope image.

 

[ds1980]

First image

 

[ds1980]

Second image

 

[ds1980]

Won't say which is which. Not sure what I'm looking for tbh but seems like a good time to buy with 25% off settings at mo.

What do you guys think of these images.

 

[TitanCi]

Won't say which is which. Not sure what I'm looking for tbh but seems like a good time to buy with 25% off settings at mo.

What do you guys think of these images.

First is better.

you want as much red as possible, which it has. Thus, it'll reflect more light to you : good. Bright stone.

The second one, you see how there's white under the table? THAT'S leakage (albeit not alot, but I wouldn't want ANY), and bad. Light is going right thru the stone.

 

[ds1980]

Thanks thats what I was hoping as it looks better to me although ja say their gemologist said the other one was slightly brighter? That said the other one is more expensive so everyone's a winner. Shall I press yeh button to buy? Going to have it shipped to friend in us and brought back to uk to save the VAT.

 

[ds1980]

Any other views on the first ideal scope image?

 

[Gypsy]

Top image is best.

 

[TitanCi]

Top image is best.

Geez, no one will buy anything unless Gypsy or DS say so!!!! what's up Gyps!!!!

 

[ds1980]

have bought

http://www.jamesallen.com/engagement-rings/pave/18k-white-gold-twisted-pave-shank-contemporary-solitaire-item-6856

wife will be pleased

thanks for all your help