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"Asscher" carat weight confusing

Jimmianne

Ideal_Rock
Premium
Joined
Dec 9, 2013
Messages
6,071
I have a 1.2 Square Cut Emerald/Asscher.
When I was looking at upgrades I found that I would really have to go up in carat weight quite a lot to gain even 1mm. So I started plugging measurements in a carat calculator to figure out what what going on and found that my random sample, a 1.5, was smaller in mm measurements than my 1.2.
How can diamonds that have near the same hxwxd measurements be different carat weights?
Both are GIA.

[Meanwhile I came down with the quite rare disease, perhaps never before documented on PS, of "Reverse DDS" and fell in love with my 1.2 again, but still wonder how carat weight works].
 

RockBrat

Shiny_Rock
Joined
Feb 22, 2016
Messages
116
It's the depth. Step cuts and certain other fancy shapes like cushions and radiants are deep stones. So a 2 ct asscher can face up significantly smaller than a 2 ct round. Just as a 1.5 ct asscher can face up the second as a 2ct, etc.
 

chrono

Super_Ideal_Rock
Premium
Joined
Apr 22, 2004
Messages
37,369
It can be hiding weight in the depth, girdle, wide/narrow corners. This is why when shopping for fancies, look at the mm size, not the ct weight.
 

Jimmianne

Ideal_Rock
Premium
Joined
Dec 9, 2013
Messages
6,071
Chrono|1457102098|3999673 said:
It can be hiding weight in the depth, girdle, wide/narrow corners. This is why when shopping for fancies, look at the mm size, not the ct weight.
The 1.5 and the 1.2 have almost exactly the same measurements - h,w,d, but the 1.2 is slightly larger in all directions with "medium to slightly thick" in while the 1.5 is "slightly thick" .
My 1.2 has slightly wider corners. So it might be both the girdle and corners. Very helpful!

I just had trouble wrapping my head around the idea of a 1.2 larger than a 1.5. I guess since GIA weighs, not measures, but we are left to interpret by mms. So I am assuming that a lower carat "stop sign" cut Asscher would have pretty much the same visual weight/finger coverage as an Asscher with tiny corners, since basically the width across can be the same for both?
With the calculator, my stone came out up to 1.47, since they can't take corners into account.

thanks for the insight.
 

Karl_K

Ideal_Rock
Trade
Joined
Aug 4, 2008
Messages
9,481

Jimmianne

Ideal_Rock
Premium
Joined
Dec 9, 2013
Messages
6,071
Thanks, Karl, for the information.
I will continue to read about and study square step-cuts, and perhaps someday take the plunge again.
I was very lucky to find a great asscher after a year of searching, which has resulted in my hesitation to upgrade. OGI gave the stone a top performance prediction and it turned out to be a winner. Sometimes it's good to stop when things are good : )
 
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