Princess questions - a bit confused...

[prettyprincess]

I have some questions regarding princess diamonds that I cannot shake off, even after sleeping on them for a few nights and I wanted to seek the expertise of the pricescope members.

I read online that the diameter of a 1 carat princess diamond is about 5.5mm. If it was a little smaller, let''s say approx. 5.3mm, and it was graded excellent polish and excellent symmetry by GIA, is there something to worry about? Is it common for a 1 carat to be a little smaller or bigger at times?

Also, I understand that asets and IS images are only "tools" to determine if a stone was of good cut when purchasing online but is in no way substitutes for the human eye (especially a trained jewler''s eye). Have anyone ever purchased a stone where the aset showed white in the center but turned out beautiful in person?

Also, what does green in the middle of the IS mean? I''ve looked everywhere to determine this color and haven''t found anything.

I appreciate the help.

 

[Todd Gray]

The diameter of a diamond will be in direct relationship to the total depth of the diamond, the deeper the total depth, the less the diameter will be for the carat weight. Most ideal cut princess cut diamonds in the one carat range will have a diameter in the range of 5.4 - 5.5 mm.

I don''t recall ever seeing green in the center of an Ideal Scope image - they are usually reddish-pink-white. Are you by chance referring to an ASET image?

The different colors provided by the ASET image show the angles from which the diamond gathers light:

Green = 0° (the horizon) to 45°
Red = 45° to 75°
Blue = 75° to 90°
Black or White indicates leakage.

WHAT THE COLORS MEAN:

Red represents light coming from angles where there is likely to be bright, direct sources of illumination in most viewing environments. This color is dominant in the ASET image of a well-cut diamond.

Blue corresponds to light that normally is blocked by the viewer’s head and body. An ASET image with a moderate amount of this color in an attractive pattern means the diamond has good contrast.

Green is produced by low-angle light, which usually is reflected from walls or other objects in the surrounding area (rather than coming from direct sources). A diamond with a high cut quality may show small amounts of this color around the bezel area of the ASET image.

Note that when Red and Green areas appear mixed together in the center region of the diamond (above the culet) this simply indicates a kind of crossover between the sources of illumination within the realm of the 45° viewing angle.

 

[stone-cold11]

Princess is smaller because the measurement is take along the length and width, which is the shortest distance between the 2 edges, while for a round it is the diameter, the max distance apart. Also, there is more ways to cut a princess than a round, number of chevrons, so more ways to retain weight than a round.

Due to the different ways to cut a princess, there is no other way to tell if a stone is well cut other than by viewing it, preferably by someone of experience, through an ASET or doing a Diamcalc using a full sarin scan of the stone.

No idea what green on IS is, never seen it, should not be there.

EDT:
Type too slowly...

 

[prettyprincess]

I have the diamcalc results but no idea as to how to read them. I have them in another post where I was searching for a stone. I unfortunately can''t post the IS and aset images because I didn''t save them on my computer.

Do you think the green in the IS might be due to bad pictures? The IS and aset images I got were ALOT lighter than the images I see on GOG or WF''s website. Maybe that''s why I thought I saw more white than there really was?

I trust the jeweler 100%, but I can''t stop but wonder. Regarding the diameter, I think it was 5.2 x 5.3, something of that sort. If it was ex/ex by GIA, it can''t be poorly cut, right? Plus the jeweler said it looks nice....

 

[stone-cold11]

Some could be good, some not so. GIA only grades the symm and polish of the stone, nothing on the cut.

EDT:

So you got the one from Exceldiamond?

If the Diamcalc file is .gem, you can use this free software, for viewing only, not for manipulation like the full version.

http://www.octonus.com/download/GemAdviserSetup.exe

Is the Diamcalc image in the previous post generated from a full sarin scan or just the average numbers? Have you check with Excel?

 

[Lorelei]

Date: 7/20/2009 7:50:02 PM
Author: prettyprincess
I have the diamcalc results but no idea as to how to read them. I have them in another post where I was searching for a stone. I unfortunately can''t post the IS and aset images because I didn''t save them on my computer.

Do you think the green in the IS might be due to bad pictures? The IS and aset images I got were ALOT lighter than the images I see on GOG or WF''s website. Maybe that''s why I thought I saw more white than there really was?

I trust the jeweler 100%, but I can''t stop but wonder. Regarding the diameter, I think it was 5.2 x 5.3, something of that sort. If it was ex/ex by GIA, it can''t be poorly cut, right? Plus the jeweler said it looks nice....

ASET and IS images of the actual stone would be better than diamcalc results. As to the green in the images, maybe you mean ASET? These show green, also with Excel''s images they tend to look a bit different to the above mentioned vendors but just a different type of set up or photography.

This page explains how to interpret these images if you haven''t already come across it.

http://www.highperformancediamonds.com/index.php?page=education-performance