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pricing on ags vs gia

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Luckiemeetoo

Rough_Rock
Joined
May 22, 2009
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I've done a lot of research thanks to pricescope and have narrowed my search down to two diamonds, one gia and the other ags. They are very comparable and the best priced I could find, both si1, 1.51 carat, H color, the ags a triple 0 ideal cut and the gia an excellent cut w/ex polish and symmetry, both are also hearts and arrows.

This leads me to my question, there is a price difference of a $1000. From what I've gathered on this site is that ags is the more reputable lab followed closely by gia, however is it worth that much of a price difference?
Any advise would be greatly appreciated, thanks!
 
The top cut grades from AGS and GIA are not the same.

GIA's cut grades are much more lenient, which benefits diamond cutters and sellers.
AGS's cut grades are much more stringent, which benefits informed diamond customers.

Yes it is possible that the same diamond sent to both labs would get their top cut grade.
But another diamond may get GIA's top cut grade and not get AGS's top cut grade.

Please look on the reports and post the following 4 numbers for the two diamonds that you think are comparable:

Depth %
Table %
Crown Angle in degrees
Pavilion Angle in degrees
 
Date: 7/11/2009 1:16:38 AM
Author:Luckiemeetoo
I've done a lot of research thanks to pricescope and have narrowed my search down to two diamonds, one gia and the other ags. They are very comparable and the best priced I could find, both si1, 1.51 carat, H color, the ags a triple 0 ideal cut and the gia an excellent cut w/ex polish and symmetry, both are also hearts and arrows.

This leads me to my question, there is a price difference of a $1000. From what I've gathered on this site is that ags is the more reputable lab followed closely by gia, however is it worth that much of a price difference?
Any advise would be greatly appreciated, thanks!
Click to expand...
Hi Luckie

Moh is right, GIA's cut grade standards are rather more wide than those of AGS, GIA Excellent can allow for what we call steep deep angled diamonds to be awarded the Excellent cut grade, and these are diamonds which sometimes do not perform well and can leak light. AGS0 is considered to be the ' safest' cut grade.

As to the price difference, if you could note all the particulars Moh suggests plus all the other info on the reports, colour and clarity and carat, diameter, star and lower girdle facets, girdle, fluorescence we might be able to see why the price difference, there are myriad reasons why the prices have a variance.
 
Ditto above.

Also the date of the report is important. Prices has fallen somewhat since last Oct.
 
The depth of the ags is 60.4
the crown 57.1
this angle /33.8
and this angle\ is 40.8

as for the gia the cert. is going to be forwarded.

I was under the impression that if they are hearts and arrows the angles would have to be within a certain perimeters?

Do you think the ags looks like a nice diamond?
 
Date: 7/11/2009 4:13:24 PM
Author: Luckiemeetoo
The depth of the ags is 60.4
the crown 57.1
this angle /33.8
and this angle is 40.8

as for the gia the cert. is going to be forwarded.

I was under the impression that if they are hearts and arrows the angles would have to be within a certain perimeters?

Do you think the ags looks like a nice diamond?
Click to expand...
The AGS diamond looks very promising. Can you post the diameter measurement, girdle thickness, star and lower girdle percentages too please? These will be on the report.
 
Here''s the AGS''s HCA

8vbetou0jpg.jpg
 
Date: 7/11/2009 4:13:24 PM
Author: Luckiemeetoo
The depth of the ags is 60.4

the crown 57.1

this angle /33.8

and this angle is 40.8

as for the gia the cert. is going to be forwarded.

I was under the impression that if they are hearts and arrows the angles would have to be within a certain perimeters?

Do you think the ags looks like a nice diamond?
Click to expand...
Numbers looks good.

H&A only meant that it has great optical symmetry, not necessary the angles for great performance. 2 different things.
 
Date: 7/11/2009 4:22:04 PM
Author: Lorelei


Date: 7/11/2009 4:13:24 PM
Author: Luckiemeetoo
The depth of the ags is 60.4
the crown 57.1
this angle /33.8
and this angle is 40.8

as for the gia the cert. is going to be forwarded.

I was under the impression that if they are hearts and arrows the angles would have to be within a certain perimeters?

Do you think the ags looks like a nice diamond?
Click to expand...
The AGS diamond looks very promising. Can you post the diameter measurement, girdle thickness, star and lower girdle percentages too please? These will be on the report.
Click to expand...
You can have badly cut diamonds which show h&a, this patterning is not necessarily a guarantee of a well cut diamond. H&A is due to the optical symmetry of the diamond, not the physical lab graded symmetry, this article explains further.

http://diamonds.pricescope.com/hna.asp

The diamond proportions and in particular the critical angles are the main engines which drive the light return, also images are crucial, especially hearts images in order to judge the overall cut precision of any so called h&a diamond.
 
faceted .9 - 3.5%
the number above that is 14.3
and below is 43.1

the diameter i believe is 7.5

Is this good? Very overwhelmed here!
 
Numbers looks good.

Star and Lower facet number are usually in the 50s and 75-85% range. Should be written on the respective facet. The number you gave is the crown and pavilion depth which can be deduced from the table, crown and pavilion angle.
 
Date: 7/11/2009 5:24:19 PM
Author: Luckiemeetoo
faceted .9 - 3.5%
the number above that is 14.3
and below is 43.1

the diameter i believe is 7.5

Is this good? Very overwhelmed here!
Click to expand...
Don't worry luckie!

If you look on the diamond diagram on the right side of the report where you got the other info from, you will see two figures on the left hand side. One will say 50%, 55% or similar at the top.

Towards the bottom you will see another percentage which says 75%, 80% or similar, these are the star and lower girdle facet percentages respectively.
 
Am I allowed to attach the actual certificate for advise? When ever i think i am beginning to understand what the numbers mean it turns out i was wrong.

Most my friends believe that i am gathering to much unneeded information but i disagree and find this all very fascinating! There are so many helpful knowledgeable people on this site, i am very grateful!
 
Date: 7/12/2009 5:37:40 PM
Author: Luckiemeetoo
Am I allowed to attach the actual certificate for advise? When ever i think i am beginning to understand what the numbers mean it turns out i was wrong.

Most my friends believe that i am gathering to much unneeded information but i disagree and find this all very fascinating! There are so many helpful knowledgeable people on this site, i am very grateful!
Click to expand...
Yes of course, please do go ahead and post the report!
 
Yes you can post it, no problem, please do.
2.gif
 
Date: 7/11/2009 1:16:38 AM
Author:Luckiemeetoo
I''ve done a lot of research thanks to pricescope and have narrowed my search down to two diamonds, one gia and the other ags. They are very comparable and the best priced I could find, both si1, 1.51 carat, H color, the ags a triple 0 ideal cut and the gia an excellent cut w/ex polish and symmetry, both are also hearts and arrows.


This leads me to my question, there is a price difference of a $1000. From what I''ve gathered on this site is that ags is the more reputable lab followed closely by gia, however is it worth that much of a price difference?

Any advise would be greatly appreciated, thanks!
Click to expand...


Just a thought but does either one of the diamonds have florescence. Or maybe one is from Canada (conflict free) These could contribute the the price difference.
 
Luckie, if you have been having trouble attaching the report, email it to admin and they will post it for you.
 
Hello Luckie,

Many posters have already given you great advice. May I however come back to your original question, is it worth that much of a price difference?

Price-differences between 2 stones can be due to a lot of factors, and the lab that happened to grade the stone might have no impact. Indeed, AGS'' top-grade for cut is clearly stricter than GIA''s, and this might be a factor for the price-difference.

But other factors might be just as or more important. One stone might be a high H, the other a low H. One might be a very attractive SI1, while the other is not.

What I am trying to say, between two stones, one might have hundreds of small differences, that all have an impact on price. Some of these can be visible in the reported data and/or in the pics.

Live long,
 
I am having the hardest time attaching this doc for sure...what is the admins e-mail for me to send it to?
 
Date: 7/13/2009 2:34:19 PM
Author: Luckiemeetoo
I am having the hardest time attaching this doc for sure...what is the admins e-mail for me to send it to?
Click to expand...
Luckie, if you use the msg admin button top right and tell them the problem, they will then give you an email address to send the image to then they will post it for you. The msg admin button has a red question mark, I would rather see the report in its entirety than a report check link, admin will help you!
 
That's great! I was able to pull the information up right away that link, thanks.

here is the specs on the diamond i am seriously considering:

Report Type: Diamond Quality™ Document
Shape and Style: Round Brilliant
Measurements: 7.50 - 7.54 x 4.54 mm
Cut Grade: AGS Ideal 0
Light Performance: 0
Proportion Factors: 0
Finish: 0
Polish: Ideal
Symmetry: Ideal
Color Grade: AGS 2.0 (H)
Clarity Grade: AGS 5 (SI1)
Carat Weight: 1.560
Fluorescence: Negligible
Comments:

Table: 57.1%
Crown Angle: 33.8
Crown Height: 14.3%
Girdle: Faceted, 0.9% to 3.5%
Pavilion Angle: 40.8
Pavilion Depth: 43.1%
Total Depth: 60.4%
Culet: Pointed
 
Can you still get admin to post the report copy please? I would like to see the clarity plot.
 
i sent it to admin, it should be coming.
 
Date: 7/13/2009 3:44:38 PM
Author: Luckiemeetoo
i sent it to admin, it should be coming.
Click to expand...
Excellent, thank you!
 
hmm... no other numbers?

There should be a star and lower facet number listed too? When is this report dated?
 
Date: 7/13/2009 3:58:24 PM
Author: Stone-cold11
hmm... no other numbers?

There should be a star and lower facet number listed too? When is this report dated?
Click to expand...
Don't worry SC, maybe he didn't see them - the report is being posted anyway and we have the most important info.
 
That took a while to attach this, I had to crop it even further to make the file size work...hope everything''s there.
Any comments would be greatly appreciated. My biggest concern is that it is not a true hearts and arrows.

Thank you admin for all the help.

hope this one works.jpg
 
I think this will be more readable.

1.56ct.jpg
 
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