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

MMtwo

Ideal_Rock
Joined
Sep 20, 2009
Messages
2,959
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

Rough_Rock
Joined
Apr 26, 2008
Messages
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

Ideal_Rock
Joined
Sep 20, 2009
Messages
2,959
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
 

magpie2

Rough_Rock
Joined
Apr 26, 2008
Messages
18
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.
 

lovedogs

Super_Ideal_Rock
Premium
Joined
Jul 31, 2014
Messages
12,879
60/60 diamonds aren't my favorite, so I personally probably wouldn't choose it, but I think it is pretty good overall.
 

jp201845

Shiny_Rock
Joined
Jun 24, 2018
Messages
497
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

Super_Ideal_Rock
Premium
Joined
Jul 31, 2014
Messages
12,879
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.
 

winetime12

Rough_Rock
Joined
Sep 21, 2020
Messages
67
This is almost exactly the proportions of my engagement ring diamond and I absolutely adore it!
 

winetime12

Rough_Rock
Joined
Sep 21, 2020
Messages
67
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

Ideal_Rock
Joined
Sep 20, 2009
Messages
2,959
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

Super_Ideal_Rock
Premium
Joined
Feb 27, 2007
Messages
24,530
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

Ideal_Rock
Joined
Sep 20, 2009
Messages
2,959
@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

Super_Ideal_Rock
Premium
Joined
Feb 27, 2007
Messages
24,530
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

Super_Ideal_Rock
Premium
Joined
Jun 8, 2008
Messages
45,925
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:
 

Garry H (Cut Nut)

Super_Ideal_Rock
Trade
Joined
Aug 15, 2000
Messages
16,147
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
Trade
Joined
Aug 15, 2000
Messages
16,147
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
2,959
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
2,959
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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