The price is comparable to similar online stones, I ran a quick Pricescope search. A similar diamond (G, SI, 53% table, 62% depth) is going for $4500 with one of the online vendors on Pricescope.
I ran a quick search using known crown and pav angles and found that the cheapest G, VS2 1.00c stone for an excellent scoring HCA stone (under 2.0) was around $6000. There was not an SI1 to compare.
So if you are fine with the steep depth and smaller table, and the stone speaks to you, then get it..sounds like the price is definitely right. Have you viewed other 1.0c stones next to it? You might possibly see a difference..an ideal with a lower depth and/or larger table might look slightly larger than this diamond. If you will view the link Leo gave above, you will see that the AGS ideal cateogry is very broad. I too learned this while searching and was confused. How could a diamond rated AGS000 get a 2.5 or 3.0 on the HCA? But it really is about liking what you *SEE*. At the end of the day, you will view the stone with your eyes--not calculators or charts. Our stone is an AGS 7, as far as you can get from an AGS 0, but its gorgeous.
Best of luck!
