lower half 75%

[buyer2011]

what do you think if a round stone with a lower half 75%. I see that Whiteflash recommends 76-80 for a "a cut above" any opinions on 75%. All other measurements look really good. It gets a 1.3 HCA, E,E,E,VG. Thank you

 

[Garry H (Cut Nut)]

if the 75% came from a GIA report then it covers 72.6% to 77.4%

 

[Garry H (Cut Nut)]

Also 70% works well with +60% table sizes where as 78% is too small for some 53% table sizes.

 

[buyer2011]

yes it ia GIA Garry

stats are:
table-56
depth-61
crown angle-34.5
pav angle-40.8
1.2 HCA, e,e,e,vg
excellent, cut, polish, symmetry
50% upper
75% lower

Please let me know your thoughts. I was thrown off because I ususally see 80% lower on the GIAs

Thank you

 

[Garry H (Cut Nut)]

Those proportions are very good and it is most unlikely the 75% will be a problem - even 73% can just prodive a little more fire and a little less brightness in some conditions.
But ideal-scope pic will help ensure nothing else is amiss

 

[buyer2011]

it does not have an ideal scope image. I may have to just buy one myself. would it be better if it said 80% lower half tho or is 75% still excellent?

I am looking for super ideal. EXCELLENT!!

 

[maplefemme]

if the 75% came from a GIA report then it covers 72.6% to 77.4%

Garry, are these GIA variables posted some where that I can look up?

Thank you

 

[Garry H (Cut Nut)]

https://www.gia.edu/facetware/
Its a copy of HCA (so much for patents) and you can try various combinations.
GIA have more variables than I put into HCA - so you can play with upper and lower girdle lenghts etc

 

[maplefemme]

https://www.gia.edu/facetware/
Its a copy of HCA (so much for patents) and you can try various combinations.
GIA have more variables than I put into HCA - so you can play with upper and lower girdle lenghts etc

Great, thank you Garry

 

[buyer2011]

does any one see any concerns with the above stats or would this be an EXCELLENT cut diamond? Thank you

FYI it does show excellent on the GIA calculator

 

[buyer2011]

would it be better to have an 80% lower? this is a very fair priced diamond with all the other cut measurements looking really good. I am just concerned (or overthinking) with the 75% Thank you

 

[Garry H (Cut Nut)]

Here is how the stones will look in a well lit environment.
80% on top 75% below

 

[buyer2011]

that looks significantly duller to me. Would you prefer to have the above diamond or

Diamond 2
table 58%
depth- 61.3%
crown angle- 34%
pavilion angle- 41
med-slightly think girle 3.5
star 50%
lower 80%
cut, polish, symmetry excellent
Hca 1.5 e,e,vg,vg
this one has more inclusions but both are vs2

 

[Garry H (Cut Nut)]

Buyer 2011 you might need to change your name to buyer 2013. it might take that long.
Can you get a photo of your first choice?
The GIA rounding error of 5% is too large to make this judgement.
The first choice will not have lower light return and can have a bit more fire.

No photo, no more advice can be offered I am afraid, because your questions are too detailed for the info we have to judge upon.

 

[buyer2011]

haha It may take me that long. I can try to get pictures but some of the place I am dealing with do not provide them. Thank you Garry

 

[Garry H (Cut Nut)]

haha It may take me that long. I can try to get pictures but some of the place I am dealing with do not provide them. Thank you Garry

Then use an appraiser or ask the vendor to compare my 2 images and comment on the relativity.
Also it is dead easy to take a half decent photo with a phone just holding a loupe infront of the lens

 

[buyer2011]

Garry I have been doin a lot of my search online. Some of the best priced interent retailers do not have very quality pics or anything which is probably why their diamonds are so much cheaper. I think with all the research I have done I should be able to get the same quality cut diamonds as a whiteflash "A CUT ABOVE" (or similar brand) without paying the extra branding price. I do have one local recommended jeweler looking as well. He has found me one extremely beautifully cut H. He is not accessing the variety that the interent provides though. I am extremely particular when it comes to cut and think I would like to move into a G. Thank you for your help

 

[Garry H (Cut Nut)]

Garry I have been doin a lot of my search online. Some of the best priced interent retailers do not have very quality pics or anything which is probably why their diamonds are so much cheaper. I think with all the research I have done I should be able to get the same quality cut diamonds as a whiteflash "A CUT ABOVE" (or similar brand) without paying the extra branding price. I do have one local recommended jeweler looking as well. He has found me one extremely beautifully cut H. He is not accessing the variety that the interent provides though. I am extremely particular when it comes to cut and think I would like to move into a G. Thank you for your help

From the classic Aussie movie, the Castle:
Tell em their dreamin

You have no hope of achieving that level of cut quality.

 

[buyer2011]

so it worth paying the extra costs to have a diamond of the quality

 

[Garry H (Cut Nut)]

so it worth paying the extra costs to have a diamond of the quality

That is your judgement. It a mind clean type thing.
Personally I remain unconvinced that a diamond with perfect H&A's sym compared to one that is not quite perfect will appear any different to humans.

 

[buyer2011]

In your opinion what are the meaurements that would create a not perfect HnA?

 

[buyer2011]

or what are the parameters that I should stay in. Please inlcude everything such as lower/star etc.? Thank you so much Garry. I really do appreciate the help. This is a huge investment for me.

 

[Garry H (Cut Nut)]

There are no 'measurements' - only what you see through a H&A's viewer. There are better and worse proportions and HCA covers my opinions on those. But H&A's is a way of assessing symmetry and your selection process without photo's is totally useless.
Afraid I can not spend any more time helping.
Work to do
Good luck

 

[buyer2011]

I wish I could just have you find a EXCELLENT diamond for me.. THANK YOU GARRY

 

[Amys Bling]

I think you are obsessing too much! lol. The first stone you asked about-Gary said it was an excellent stone. IDEALSCOPE images will help you to determine performance, so attach reports, photos, and IDEALSCOPE images and others were can help.

 

[Laila619]

I think you are obsessing too much! lol. The first stone you asked about-Gary said it was an excellent stone. IDEALSCOPE images will help you to determine performance, so attach reports, photos, and IDEALSCOPE images and others were can help.

Yes, the first stone had very nice numbers!

GIA rounds some numbers, so with the 75% LGF, you don't really know if they're, say, 73% or 77%. You know what I mean? What you could do is get a SARIN scan on that stone so you know what the actual LGF are. If they're 76 or 77, that's great.

 

[buyer2011]

Thank you for your advice. I will call tomorrow and see if I can get some sort of images. All I have right now is the GIA. How do I get a Sarin?

 

[Garry H (Cut Nut)]

I wish I could just have you find a EXCELLENT diamond for me.. THANK YOU GARRY

You can. Jump on a plane. Fly to Melbourne and come to my shop. But I am a full service B&M and you already think WF is too expensive.

 

[Dreamer_D]

Yup, analysis paralysis has set in Either of those options you posted would be great, I'll bet you good money! I even bet you won't be able to tell the difference between them if you had them side by side in normal wear! The nuaces of lgf is really subtle, it is someting that people who are very familiar with diamonds can see, but you have to own and live with diamonds for a while with different lgf ratios to really see the difference. And even then, it is subtle. The combined effect of all the small variables that differe between those diamonds you posted likely accounts for much more variance in their appears (as small as that discrepancy is!) than the lgf on their own.

So my advice? Stop getting bogged down and see them in person, or just pick one of those two based on some more tangible factor, like color or clarity or price.

 

[yssie]

Oh what a tangled web we weave...

No deception though. Yes, all those numbers mean something. Yes, all those gidgets tell you something about what those numbers mean. Yes, all those differences yield nuances in appearance and light return.

It's fun to talk about, but what those differences actually mean to you is a totally meaningless discussion without some sort of scale calibrated specifically to what sorts of nuances you like to see. And you don't have that scale yet, and may never. Nothing wrong with that, other than that it's making you worry about all sorts of things you needn't! Just pick something. 75 is fine, so are 74 and 77. If you see 70- or 85+ pause and come back to PS.

ETA: Um. What Dreamer said. Serves me right for not reading through the thread.