1.) If a 1A cut is an AGS 0 cut - what would a 2A be?

2.) If I find a diamond listed as 7.69 - 7.72 and find another diamond listed as 7.76 - 7.79 would the extra diameter be noticable and worth the extra money?

At what measurement do you start to notice a change in size?

3.) What is the prices difference for a 1A diamond and a 2A diamond? 5%, 10%, 15%...

1.) If a 1A cut is an AGS 0 cut - what would a 2A be?

I tried to put comparison tables below. As you can see, 1A is more strict than AGS0 i.e, average 1A stone is more close to Tolkowsky than AGS0

________________| AGS 0 | 1A
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Table Diameter: | 52.4 - 57.5% | 53-58%
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Crown Angle: | 33.7 - 35.8° | 34.3-34.7°
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Pavilion %: | 42.2 - 43.8% | 42.8-43.2%
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Girdle Thickness:| Thin, Medium, Slightly Thick | Medium

As for 2A, difficult to say - they overlap

________________| AGS 1 | AGS 2 | AGS 3 | 2A
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Table Diameter: | 51.4-59.5% | 59.6-61.5% | 50.4-63.5% | 51.5-63%
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Crown Angle: | 32.7-36.3° | 32.2-36.8° | 31.7-37.3° | 33.9-35.8°
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Pavilion %: | 43.9-44.3% | 41.7-44.8% | 41.7-4.8% | 42.4-44.0%
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Girdle Thickness: | Very Thin | Vr Thin to Sl Thick | Thick | thin to sl. thick
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2.) If I find a diamond listed as 7.69 - 7.72 and find another diamond listed as 7.76 - 7.79 would the extra diameter be noticable and worth the extra money?

I guess larger diameter (spread) at the same weight should be beneficial but you have to consider other factors too: girdle, crown and pavilion angles, etc. You might want to check the Cut Adviser to analyse the stones on overall visual performance: www.pricescope.com/cutadviser.asp

3.) What is the prices difference for a 1A diamond and a 2A diamond? 5%, 10%, 15%...

Check price stats for different cut grades on this site: www.pricescope.com/repscope.asp

Hope it helps

[This message has been edited by leonid (edited 12-07-2000).]

You will find that an AGS 0 may be still deeper than the 62.99% total depth of our 1B parameter.

I know it is a game for diamond cutters to save weight and still get the "0" grade. It is just a similar game for cinsumers to be aware of it and opt for the best make stones that are really cut right.

I use the AGA/NAJA system because it gives me the most accurate judge of cut available to me today.