The stone does very well on the HCA and ranks a 0.8 using percentages for crown and pavilion hieght/depth rather than angles.
I just checked pricescope for a 1.30 G VS1 graded by GIA and AGS with similar table and total depth percentages (which doesn't even take into account crown and pavilion angles) and the price for a 1.30 carat stone in this range varried from $8710-$9581, so I would say that your doing well with a price of $7,000.
Who is certifying this stone; are they a respected lab (GIA/AGS)?
Should you buy it or drop to a similar SI1? That depends on what this vendor would sell you a similar diamond in all aspects except that it were an SI1 (You would have to make sure it was an eyeclean SI1). Do you want to pay the difference is the only question? Why don't you talk to the vendor.
If it were me, I would drop to SI1, make sure the stone is eyeclean, and go up in color grade to say an "E," but others would say, no, stay with what you've got. Even the advice in one of the tutorials for pricescope I believe says to not purchase an E colored SI2 stone, which is exactly what I did, so take this part of my advice for what it is...an opinnion. I, for one, would notice the difference from "E" to "G" color but would not notice the difference in VS2 and SI1 provided, of course, that the SI1 inclusions were not eye visible. It's just up to you what you want in your stone.
Make sure to make the sale contigent on your being happy with an independant appraisal of the stone or have a good return policy in case the stone does not satisfy you in any way especialy if you are ordering the stone sight unseen.
