For sale is a 18k white-gold engagement ring with a 1 carat (1.006 to be exact) AGS-0 Ideal Cut H/VS-1 princess cut center stone surrounded by 4 channel-set .10 carat (each) H/VS princess cut side stones (2 on each side) for a total weight of 1.4 carats.

Here are the stats for the center stone:
Cut: AGS 0 Ideal
Carat weight: 1.006
Color: H
Clarity: VS-1
AGS Specifications
Certificate Number : 9467709
Measurements (in mm): 5.52 x 5.48 x 4.12
Depth : 75.1
Table : 58.8%
Girdle : thin to slightly thick
Culet : None
Polish : Ideal
Symmetry : Ideal
Fluorescence : None

The center stone is the highest graded cut that is available for princess cut diamonds - AGS 0 Ideal. Here is a link which explains (about halfway down the page):
http://www.whiteflash.com/diamonds_info/t/princess.aspx?articleid=347&zoneid=29

One additional note on the center stone are the Brilliancescope results. Brilliancescope is a computerized system that measures what all women really care about, the "fire" and "sparkle" of a diamond. By using the computer, it takes the human bias out of the equation. Here is what was sent to me by the jeweler for this stone when we were looking for that 'perfect stone':
"We have run the Brilliancescope today on this 1 carat H/VS-1 AGS Ideal princess and the results are fabulous: VH3+ on all three measurements: white light, colored light, and scintillation with half the bar buried on the right-hand margin on all three measurements. This is one of the very best Bscope results we have seen in a long time. Just a great diamond!"
Here is some more information on the Brilliancescope:
http://www.gemex.com/products-services/brilliancescope.html

The ring is a size 4 but can obviously be sized by your favorite jeweler. Band shows some signs of wear that will disappear with a quick polish.

Thanks for looking!