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XXX .9 on HCA, GIA x, spready, but shows outside of EX on chart?

MMtwo

Ideal_Rock
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Sep 20, 2009
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4,441
I am considering an upgrade. To keep the upgrade credit from my .82 solitaire, I will return to Ritani to upgrade. I want the same yellow-gold knife solitaire RB I have, just larger (DSS problems!).
I found this stone. I like the spread factor (I am eyeing the budget) It scores a GIA XXX (covering cert number as it is not on hold yet). It looks awesome on the HCA, but it graphs as though it would not be a GIA Excellent. Can anyone help me understand why these do not line up? I struggle with angles and really understanding the nitty gritty sometimes. Thanks!
upgrade.png
graph.png
 
Last edited:

magpie2

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Apr 26, 2008
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18
I had a similar experience recently and discovered GIA facetware while trying to make sense of things (it's on the GIA site - it's free). Unsurprisingly, given that your stone got a GIA triple EX grading, it checks out on their programme. So, I looked at another site which gives both GIA and AGS grade guides. On there, the diamond fell just outside the GIA range. Can't say why that's the case, but I can tell you - according to that chart - if your diamond had a crown angle of 32.5 degrees it would have potentially made AGS 0 and GIA EX or if the pavilion angle was 41.1 with a crown of 32 it would have potentially made AGS0. You'll find that the 32 crown is not to everyone's taste, but the GIA facetware indicated a 13.1% crown height, should any commentators be interested.
 

MMtwo

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Thank you MagPie.

Not sure if this gif will work.
Hmm, not sure now. Do you think it's okay?
PS: I like low colored diamonds :)



chrome-capture.gif
 

flyingpig

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Click the booklet (cut estimate table). There is an explanation for borderline EX-VG stones.
 

MMtwo

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magpie2

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Well, I'm not really qualified to comment, and the gif moving all the time doesn't really help in assessing how well cut the stone is. But, having said that, there is a point where some pretty good looking arrows appear. If you could take a shot of that view and post it, I'm sure those who really know their stuff will give you some advice.
 

MMtwo

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Thanks, magpie :) This may be more helpful.

screenshot (7).png
 

lovedogs

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60/60 diamonds aren't my favorite, so I personally probably wouldn't choose it, but I think it is pretty good overall.
 

jp201845

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Jun 24, 2018
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60/60 diamonds aren't my favorite, so I personally probably wouldn't choose it, but I think it is pretty good overall.

I don’t think this is a 60/60 diamond it has a 58 table and 60 depth so in my opinion it doesn’t fall in that range.....

Would a 56 or 57 table with a 60 depth be considered 60/60 ?
 

lovedogs

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I don’t think this is a 60/60 diamond it has a 58 table and 60 depth so in my opinion it doesn’t fall in that range.....

Would a 56 or 57 table with a 60 depth be considered 60/60 ?

whoops! My bad. I looked at the pic and crown/pav and assumed. It's not actually a 60/60. I'm overall not a fan of it the more I look at it.
 

headlight

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I don’t find the large table reflection aesthetically pleasing.
 

winetime12

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Sep 21, 2020
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This is almost exactly the proportions of my engagement ring diamond and I absolutely adore it!
 

MMtwo

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4,441

MMtwo

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Sep 20, 2009
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This is almost exactly the proportions of my engagement ring diamond and I absolutely adore it!

Is this your avitar? I think it's beautiful.
 

MMtwo

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MMtwo

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winetime12

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Wow, that is so close to my stats! Do you see much fire? I do want to see some fire. HCA indicates I will, but that is a concern (still debating diamonds and thinking about options).
The fire shots definitely exist under certain lighting, but I haven’t been able to capture the long shots. However, the stone is insanely bright and clear in almost every lighting!
F2800A55-BD9B-41FE-B39C-9B96C4439668.jpeg
 

MMtwo

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Thanks, Winetime12. It's very pretty.

I did decide to go with it. Sometimes "almost" is a good compromise. This may well be upgraded again and I was trying to keep the price down to keep my upgrade amount easier next time. This is a 2nd e-ring of mine for me.

It's still puzzling to me that the facetware puts the crown at 13.1% when the cert lists it at 13.5 %. Also the charts show it as VG, but GIA is showing X, as is the HCA. I can post the cert now.

A lucky diamond, it was graded on my birthday :)

 

marcy

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26,273
Thanks, Winetime12. It's very pretty.

I did decide to go with it. Sometimes "almost" is a good compromise. This may well be upgraded again and I was trying to keep the price down to keep my upgrade amount easier next time. This is a 2nd e-ring of mine for me.

It's still puzzling to me that the facetware puts the crown at 13.1% when the cert lists it at 13.5 %. Also the charts show it as VG, but GIA is showing X, as is the HCA. I can post the cert now.

A lucky diamond, it was graded on my birthday :)


Sweet - your diamond is a med florescent too. Do you have a UV Light? It is so fun to "see" what changes colors with ultraviolet.
 

MMtwo

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@MMtwo I saw in your other thread that the GIA cert is on your birthday - it was meant to be. Brittany said my ring would be 2 weeks in shop but I don't know if that includes getting the ring from Stuller, I bet I'll get mine about the same time as yours. I can hardly wait.

I do, the little stone I am upgrading was strong blue. I played with it like a little kid. Love that yours is med fluorescent too. My last one was strong
20210117_080429.jpg
 

marcy

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I do, the little stone I am upgrading was strong blue. I played with it like a little kid. Love that yours is med fluorescent too. My last one was strong
20210117_080429.jpg

It is fun to play with. Some of my sapphires really change colors. My EC is a medium florescent.
 

missy

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53,978
Thanks, Winetime12. It's very pretty.

I did decide to go with it. Sometimes "almost" is a good compromise. This may well be upgraded again and I was trying to keep the price down to keep my upgrade amount easier next time. This is a 2nd e-ring of mine for me.

It's still puzzling to me that the facetware puts the crown at 13.1% when the cert lists it at 13.5 %. Also the charts show it as VG, but GIA is showing X, as is the HCA. I can post the cert now.

A lucky diamond, it was graded on my birthday :)


Meant to be yours! :love:
 

MMtwo

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Sep 20, 2009
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Last edited:

Garry H (Cut Nut)

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Those proportions should make AGS 0 but AGs also have stricter polish and symmetry requirements.
GIA facet ware and GIA lab grades often deviate by a lot. e.g. the way GIA work is to add the crown height, girdle thickness and pavilion depth - and in theory that must fall at max 63% - yet even by that rule this stone adds to 63.5% and still managed Excellent.

The human approach to apply depth % (used for at least 100 years) is to calculate the depth % as a factor of the average diameter (for a round, or the width for other shapes). Please don't ask me why GIA use their approach or I will have to tell you my opinion, and it is disrespectful to criticise people from other nations.
1614566396766.png
 

Garry H (Cut Nut)

Super_Ideal_Rock
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Joined
Aug 15, 2000
Messages
18,418
I am considering an upgrade. To keep the upgrade credit from my .82 solitaire, I will return to Ritani to upgrade. I want the same yellow-gold knife solitaire RB I have, just larger (DSS problems!).
I found this stone. I like the spread factor (I am eyeing the budget) It scores a GIA XXX (covering cert number as it is not on hold yet). It looks awesome on the HCA, but it graphs as though it would not be a GIA Excellent. Can anyone help me understand why these do not line up? I struggle with angles and really understanding the nitty gritty sometimes. Thanks!
upgrade.png
graph.png

If you can not focus closer than 12 inches you will love that diamond and it has a bigger spread.

798237
 

MMtwo

Ideal_Rock
Joined
Sep 20, 2009
Messages
4,441
If you can not focus closer than 12 inches you will love that diamond and it has a bigger spread.

shallow girl gif.gif

At 56, I'm going to love this diamond ;-) heh.
Thanks for helping me out on this one. Great illustration, thanks.
 

MMtwo

Ideal_Rock
Joined
Sep 20, 2009
Messages
4,441
Those proportions should make AGS 0 but AGs also have stricter polish and symmetry requirements.
GIA facet ware and GIA lab grades often deviate by a lot. e.g. the way GIA work is to add the crown height, girdle thickness and pavilion depth - and in theory that must fall at max 63% - yet even by that rule this stone adds to 63.5% and still managed Excellent.

The human approach to apply depth % (used for at least 100 years) is to calculate the depth % as a factor of the average diameter (for a round, or the width for other shapes). Please don't ask me why GIA use their approach or I will have to tell you my opinion, and it is disrespectful to criticise people from other nations.
1614566396766.png

I just saw this post too. Thank you so much for explaining. I appreciate the HCA tool. So helpful.
 
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