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AGS grading system

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pelepup

Rough_Rock
Joined
Jun 5, 2003
Messages
24
Hi,
I bought a diamond on ebay that had an old appraisal using the AGS numbering system. I did a quick search and found that AGS has upgraded the numbering system to correspond better with GIA. So how is it different than their old system? This appraisal is from 1979 and states that the color of the diamond is AGS-4, clarity is AGS-4 and cut is AGS-3. How does that relate to the current GIA scheme? Thanks for any help.
 

69gm

Shiny_Rock
Joined
Apr 28, 2003
Messages
287
AGS equals GIA for color
0 D
0.5 E
1.0 F
1.5 G
2.0 H
2.5 I
3.0 J
3.5 K
4.0 L
4.5 M
5.0 N
5.5 O
etc. all the way to:
10 X,Y,Z

for clarity
0 FL/IF
1 VVS1
2 VVS2
3 VS1
4 VS2
5 SI1
6 SI2
7 I1
8 I2
9 I3

and you can go here for the cut:

http://www.diamondgrading.com/Articles_GIA_vs_AGS_CUT.htm

hope this helps.
 

Mara

Super_Ideal_Rock
Joined
Oct 30, 2002
Messages
31,003
69..if that is a recent chart, sounds like the original poster is saying that AGS used to have a different 0-10 system, I wonder if the info you posted STILL corresponds or would be different from 1979 AGS grading?

Possibly a member of the trade could pipe up?
 

Richard Sherwood

Ideal_Rock
Joined
Sep 25, 2002
Messages
4,924
I think the clarity grading scale remained the same, as 69gm posted, while the color grading scale changed. A copy of the original scale is attached.

According to that, the stone was graded as an IJ color, VS2 clarity, with a good cut.

GIA vs AGS III.jpg
 

pelepup

Rough_Rock
Joined
Jun 5, 2003
Messages
24
Thanks everyone for the info! I'm going to get an official appraisal next week, but was wondering what the old appraisal meant. The old appraisal was apparently done with the stone already set so I expect that it will be off when I get the appraisal done with the stone removed and loose.
 

Mara

Super_Ideal_Rock
Joined
Oct 30, 2002
Messages
31,003
Thats an interesting picture, Rich. Note how colors D-I/J shows on the left side as 'mounted stones will appear colorless'. I like the 'tinted white' vs colorless/near/light yellwo etc..very interesting.
 
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