One last suggestion though--Pricescope is a great site in many ways, but don't follow their advice blindly. Be sure you look at things in person and make up your own mind. They have some vendors they tend to push--who are great vendors, but there are others. Also, although 'cut is king' it may not be important to you personally to have a super-duper ideal diamond, instead of one which is excellent, or even 'very good' cut that has no real visual differences (but doesn't have the paper qualifications that P'scopers like).
I got two diamonds while I was on P'scope, a solitaire ring and a pair of stud earrings. Both are much nicer than they would have been if I had not been on Pricescope and not read their advice. the earrings are from one of their preferred vendors, whiteflash.com and they are superb earrings (H VS2, ACA AGS 000). The solitaire is from Bluenile.com, which is a site that is dissed a lot on Pricescope because they don't give you all the papers Pricescopers like, but it's a gorgeous diamond and not visually any different from the ACAs. I made sure that it also had an AGS cert and ran the numbers through something they have there which is very useful called the 'Holloway Cut Advisor' and got a beautiful ring for somewhat less of a price than it would have been on whiteflash,com (though both places have better prices than highend brick and mortar stores with comparable diamonds). A GIA cert would also have been fine.
I am by no means an expert, but since being on Pricescope, I learned what I like. I buy diamonds most of the time now in my local pawnshop and have gotten great deals (verified always by an appraiser) because I became an educated consumer. You can, too--it's not a very difficult thing to do.